Maths Library

Number Pairs and Fact Families: Grade 1 math

This topic introduces pairs of numbers that combine to make key benchmark values like 5, 10, and 20. Worksheets give pupils structured drill and pictorial support to develop instant recall of basic additive facts.

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What this covers

Number Pairs and Fact Families is taught in Grade 1 (age 6 to 7) as a topic to introduce. It sits in the Number strand.

Worked example

Find the missing number to complete the bond to 10: 7 + __ = 10

  1. Start at 7 and count on to 10: 8, 9, 10.
  2. Three counts were needed.
  3. Check: 7 + 3 = 10.

Answer: 3

Difficulty scale

The sheet generator offers five difficulty settings for this topic.

  1. Pairs summing to 5 using visual tens frames
  2. Pairs summing to 10 with partial visual support
  3. Pure symbolic pairs summing to 10
  4. Pairs summing to 20 involving multiples of 5 or ten plus ones
  5. Arbitrary pairs summing to 20 with missing addends in any position

Common mistakes

  • Subtracting the given addend from the wrong base (e.g., thinking 10 - 4 is 5)
  • Confusing the part and the whole in bar or part-whole models

Curriculum links

Indicative matches to Common Core State Standards. Check wording and codes against the official document.

  • 1.OA.C.6 Add and subtract within 20, demonstrating fluency for facts within 10.

Sample sheet and answers

Six questions at the level's usual difficulty. Open the editor to change, add or regenerate any of them.

Number Pairs and Fact Families

Grade 1 math

Qs
6
Marks
6
NameDateScore / 6
1.
9 + = 10
[1]
2.
1 + = 10
[1]
3.
6 + = 10
[1]
4.
9 + = 10
[1]
5.
4 + = 10
[1]
6.
10 + = 10
[1]

Answer key

  1. 110 − 9 = 1
  2. 910 − 1 = 9
  3. 410 − 6 = 4
  4. 110 − 9 = 1
  5. 610 − 4 = 6
  6. 010 − 10 = 0