# Addition

Here is a list of all of the skills that cover addition! These skills are organised by year, and you can move your mouse over any skill name to preview the skill. To start practising, just click on any link. IXL will track your score, and the questions will automatically increase in difficulty as you improve!

## Senior-infants skills

- J.1 Add with pictures - sums up to 5
- J.2 Addition sentences - sums up to 5
- J.3 Make a number using addition - sums up to 5
- J.4 Add two numbers - sums up to 5
- J.5 Complete the addition sentence - sums up to 5
- J.6 Addition word problems - sums up to 5
- K.1 Add with pictures - sums up to 10
- K.2 Addition sentences - sums up to 10
- K.3 Make a number using addition - sums up to 10
- K.4 Add two numbers - sums up to 10
- K.5 Complete the addition sentence - sums up to 10
- K.6 Complete the addition sentence - make ten
- K.7 Write addition sentences
- K.8 Addition word problems - sums up to 10
- V.1 Sum and difference

## First-class skills

- B.1 Add with pictures - sums up to 10
- B.2 Addition sentences - sums up to 10
- B.3 Addition sentences using number lines - sums up to 10
- B.4 Adding zero
- C.1 Adding 1
- C.2 Adding 2
- C.3 Adding 3
- C.4 Adding 4
- C.5 Adding 5
- C.6 Adding 6
- C.7 Adding 7
- C.8 Adding 8
- C.9 Adding 9
- C.10 Adding 0
- D.1 Addition facts - sums up to 10
- D.2 Ways to make a number - addition sentences
- D.3 Make a number using addition - sums up to 10
- D.4 Complete the addition sentence - sums up to 10
- D.5 Addition word problems - sums up to 10
- D.6 Addition sentences for word problems - sums up to 10
- D.7 Addition facts - sums up to 18
- D.8 Addition sentences using number lines - sums up to 18
- D.9 Addition word problems - sums up to 18
- D.10 Addition sentences for word problems - sums up to 18
- D.11 Addition facts - sums up to 20
- D.12 Make a number using addition - sums up to 20
- D.13 Addition sentences for word problems - sums up to 20
- D.14 Related addition facts
- D.15 Addition sentences: true or false?
- D.16 Add a one-digit number to a two-digit number - without regrouping
- D.17 Add a one-digit number to a two-digit number - with regrouping
- D.18 Add two two-digit numbers - without regrouping
- D.19 Add two two-digit numbers - with regrouping
- D.20 Addition word problems - up to two digits
- E.1 Add doubles
- E.2 Add using doubles plus one
- E.3 Add using doubles minus one
- E.4 Add three numbers - use doubles
- E.5 Complete the addition sentence - make ten
- E.6 Add three numbers - make ten
- E.7 Add two multiples of ten
- E.8 Add a multiple of ten
- E.9 Add three numbers
- E.10 Add three numbers - word problems
- I.1 Relate addition and subtraction sentences
- W.1 Addition and subtraction - ways to make a number
- W.2 Which sign makes the number sentence true?
- W.3 Fact families
- W.4 Addition and subtraction facts - numbers up to 10
- W.5 Addition and subtraction facts - numbers up to 18
- W.6 Addition and subtraction word problems
- W.7 Ten more or less
- W.8 Add and subtract tens
- W.9 Addition and subtraction terms

## Second-class skills

- E.1 Review - add one-digit numbers - sums to 10
- E.2 Review - ways to make a number - sums to 10
- E.3 Review - writing addition sentences - sums to 10
- E.4 Add doubles
- E.5 Add one-digit numbers
- E.6 Addition with pictures - sums to 20
- E.7 Write addition sentences to describe pictures - sums to 20
- E.8 Addition input/output tables - sums to 20
- E.9 Add zero
- E.10 Addition word problems - one digit
- E.11 Complete the addition sentence - one digit
- E.12 Write the addition sentence - one digit
- E.13 Balance addition equations - one digit
- E.14 Add three or more one-digit numbers
- E.15 Add three or more one-digit numbers - word problems
- E.16 Identify repeated addition in arrays: sums to 10
- E.17 Write addition sentences for arrays: sums to 10
- E.18 Identify repeated addition in arrays: sums to 25
- E.19 Write addition sentences for arrays: sums to 25
- G.1 Add multiples of 10
- G.2 Add a two-digit and a one-digit number - without regrouping
- G.3 Add a two-digit and a one-digit number - with regrouping
- G.4 Add two two-digit numbers - without regrouping
- G.5 Add two two-digit numbers - with regrouping
- G.6 Write addition sentences to describe pictures
- G.7 Addition input/output tables - up to two digits
- G.8 Ways to make a number using addition
- G.9 Addition word problems - up to two digits
- G.10 Complete the addition sentence - up to two digits
- G.11 Write the addition sentence - up to two digits
- G.12 Balance addition equations - up to two digits
- G.13 Add three or more numbers up to two digits each
- G.14 Add three or more numbers up to two digits - word problems
- I.1 Add multiples of 100
- I.2 Addition with three-digit numbers
- I.3 Addition input/output tables - up to three digits
- I.4 Addition word problems - up to three digits
- I.5 Complete the addition sentence - up to three digits
- I.6 Write the addition sentence - up to three digits
- I.7 Balance addition equations - up to three digits
- K.1 Related addition facts
- K.3 Fact families
- K.5 Solve inequalities using addition and subtraction shortcuts
- M.5 Estimate sums
- N.8 Add and subtract money - up to €1
- N.9 Add and subtract money - word problems - up to €1
- N.10 Add and subtract money - word problems - up to €5
- X.1 Add and subtract numbers up to 20
- X.2 Addition and subtraction - ways to make a number - up to 20
- X.3 Addition and subtraction word problems - up to 20
- X.4 Addition and subtraction - balance equations - up to 20
- X.5 Input/output tables - write the rule - up to 20
- X.6 Add and subtract numbers up to 100
- X.7 Addition and subtraction - ways to make a number - up to 100
- X.8 Addition and subtraction word problems - up to 100
- X.9 Addition and subtraction - balance equations - up to 100
- X.10 Input/output tables - write the rule - up to 100
- X.11 Which sign (+ or -) makes the number sentence true?
- X.12 Write addition and subtraction sentences
- X.13 Inequalities with addition and subtraction - up to 100

## Third-class skills

- A.11 Comparing - with addition and subtraction
- A.12 Multi-step inequalities
- C.1 Add two numbers up to three digits
- C.2 Addition input/output tables - up to three digits
- C.3 Add two numbers up to three digits - word problems
- C.4 Complete the addition sentence - up to three digits
- C.5 Balance addition equations - up to three digits
- C.6 Add three or more numbers up to three digits each
- C.7 Add three or more numbers up to three digits - word problems
- C.8 Addition patterns over increasing place values
- C.9 Add two numbers with four or more digits
- C.10 Addition input/output tables - four or more digits
- C.11 Add two numbers with four or more digits - word problems
- C.12 Complete the addition sentence - four or more digits
- C.13 Balance equations - four or more digits
- C.14 Add three or more numbers with four or more digits
- C.15 Add three or more numbers with four or more digits - word problems
- C.16 Addition: fill in the missing digits
- O.7 Add and subtract money amounts
- O.8 Add money amounts - word problems
- S.3 Properties of addition
- S.4 Solve using properties of addition
- S.9 Relate addition and multiplication
- U.5 Estimate sums
- U.6 Estimate sums: word problems
- Y.7 Add and subtract decimals
- Y.8 Add and subtract decimals - word problems
- Y.9 Add three or more decimal numbers

## Fourth-class skills

- B.1 Add numbers up to five digits
- B.2 Add numbers up to five digits: word problems
- B.3 Addition: fill in the missing digits
- B.4 Properties of addition
- B.5 Add three or more numbers up to five digits each
- B.6 Addition patterns over increasing place values
- B.7 Choose numbers with a particular sum
- B.8 Estimate sums
- B.9 Estimate sums: word problems
- F.8 Mentally add and subtract numbers ending in zeroes
- L.3 Add and subtract money amounts
- L.6 Price lists
- R.2 Add and subtract fractions with like denominators using number lines
- R.3 Add and subtract fractions with like denominators
- R.4 Add and subtract fractions with like denominators: word problems
- R.5 Add and subtract mixed numbers with like denominators
- R.6 Add and subtract mixed numbers with like denominators: word problems
- R.7 Add up to 4 fractions with denominators of 10 and 100
- R.8 Add three or more fractions
- R.9 Add three or more fractions: word problems
- R.10 Complete addition and subtraction sentences with fractions
- U.1 Add decimal numbers
- U.3 Add and subtract decimals: word problems
- U.4 Choose decimals with a particular sum or difference
- U.5 Add three or more decimals
- U.6 Add three or more decimals: word problems
- U.7 Complete the addition or subtraction sentence
- U.8 Inequalities with addition and subtraction
- U.9 Estimate sums and differences of decimals

## Fifth-class skills

- B.1 Add and subtract whole numbers up to millions
- B.2 Add and subtract whole numbers: word problems
- B.3 Complete addition and subtraction sentences
- B.4 Fill in the missing digits
- B.5 Choose numbers with a particular sum or difference
- B.6 Properties of addition
- B.7 Inequalities with addition and subtraction
- B.8 Estimate sums and differences of whole numbers
- B.9 Estimate sums and differences: word problems
- G.1 Add and subtract decimal numbers
- G.2 Add and subtract decimals: word problems
- G.3 Choose decimals with a particular sum or difference
- G.4 Complete the addition or subtraction sentence
- G.5 Inequalities with decimal addition and subtraction
- G.6 Estimate sums and differences of decimals
- K.2 Add and subtract fractions with like denominators using number lines
- K.3 Add and subtract fractions with like denominators
- K.4 Add and subtract fractions with like denominators: word problems
- K.5 Add and subtract mixed numbers with like denominators
- K.6 Add up to 4 fractions with denominators of 10 and 100
- K.7 Add fractions with unlike denominators
- K.9 Add and subtract fractions with unlike denominators: word problems
- K.10 Add three or more fractions with unlike denominators
- K.11 Add three or more fractions: word problems
- K.12 Complete addition and subtraction sentences with fractions
- K.13 Inequalities with addition and subtraction of fractions
- K.14 Estimate sums and differences of mixed numbers
- K.15 Add mixed numbers with unlike denominators
- K.17 Add and subtract mixed numbers: word problems
- K.18 Complete addition and subtraction sentences with mixed numbers
- K.19 Inequalities with addition and subtraction of mixed numbers
- P.1 Add and subtract money amounts
- P.2 Add and subtract money: word problems

## Sixth-class skills

- A.4 Add and subtract whole numbers
- A.5 Add and subtract whole numbers: word problems
- G.1 Add and subtract decimal numbers
- G.2 Add and subtract decimals: word problems
- G.3 Estimate sums and differences of decimals
- G.4 Maps with decimal distances
- J.1 Add and subtract fractions with like denominators
- J.2 Add and subtract fractions with like denominators: word problems
- J.3 Add and subtract fractions with unlike denominators
- J.4 Add and subtract fractions with unlike denominators: word problems
- J.5 Inequalities with addition and subtraction of like and unlike fractions
- J.6 Add and subtract mixed numbers
- J.7 Add and subtract mixed numbers: word problems
- J.8 Estimate sums and differences of mixed numbers
- N.1 Add integers using counters
- N.2 Add integers
- N.5 Add and subtract integers: find the sign
- N.6 Add and subtract integers: input/output tables
- N.7 Add three or more integers
- U.2 Add and subtract money amounts
- U.3 Add and subtract money amounts: word problems
- Y.8 Properties of addition

## First-year skills

- C.1 Integer addition and subtraction rules
- C.2 Add and subtract integers using counters
- C.3 Add and subtract integers
- C.4 Complete addition and subtraction sentences with integers
- C.5 Add and subtract integers: word problems
- E.1 Add and subtract decimals
- E.2 Add and subtract decimals: word problems
- E.10 Maps with decimal distances
- G.1 Add and subtract fractions
- G.2 Add and subtract fractions: word problems
- G.3 Add and subtract mixed numbers
- G.4 Add and subtract mixed numbers: word problems
- G.5 Inequalities with addition and subtraction of fractions and mixed numbers
- G.6 Estimate sums and differences of mixed numbers
- H.6 Add and subtract rational numbers
- H.7 Apply addition and subtraction rules
- R.9 Properties of addition and multiplication

## Second-year skills

- C.1 Integer addition and subtraction rules
- C.2 Add and subtract integers using counters
- C.3 Add and subtract integers
- C.4 Add and subtract three or more integers
- C.5 Add and subtract integers: word problems
- E.2 Add and subtract rational numbers
- E.3 Add and subtract rational numbers: word problems
- E.4 Apply addition and subtraction rules
- E.8 Apply addition, subtraction, multiplication and division rules
- W.11 Properties of addition and multiplication
- X.11 Solve equations: word problems