Year 1 Addition and subtraction facts within 10 worksheet

“Swap the Numbers!” is free to print, with no account. It is the first sheet in the Year 1 maths unit “Addition and subtraction facts within 10”, for children aged 5 to 6, and takes about 20 minutes.

Print it on A4. The child's pages come first; the answers, and what each wrong answer tells you, are on the grown-up page that follows. Weeks 22 to 24 of the year, 15 sheets in the unit.

Free sample · answers on the last page

Swap the Numbers!

Name: ____________ · Date: ____________
Year 1 · Maths · about 20 minutes
Answers are on the grown-up page

Today I can swap the numbers in an addition and still get the same sum.

A Look back3 min

1.
2 + 3 =
2.
10 = 6 +
3.
9 − 4 =

B Watch me, then you4 min

Ella has 5 green beads and Ben has 2 yellow beads. Put them together and count them all.

Watch me

2 beads and 5 beads make 7 altogether.

2 + 5 = 7

Swap them: 5 + 2 = 7.

Both number sentences give 7, so the order does not change the sum.

Now you

1.
4 + 6 = 10. Swap them: 6 + 4 =

C Your turn6 min

1.
3 + 5 =
2.
5 + 3 =
3.
+ 3 = 3 + 6
4.
10 + 6 = 16, so 6 + 10 =

Say it out loud: What stayed the same when you swapped the numbers round? Why did it stay the same?

D Spot the mistake3 min

Ali says: “3 + 4 is 7, so 4 + 3 must be 8, one more.”

1.
What does 4 + 3 really make?

E Think deeper4 min

1.
Think of an addition where the numbers make 10 or less. Write it, then swap the numbers and write that too. Explain why both sums match.

How did it feel?

I can do it Nearly Not yet

For the grown-up

Swap the Numbers! · 2 minutes to read

Answers, and what a wrong one tells you

A

1. 5

2. 4

3. 5

B

1. 10

C

1. 8

2. 8 If your child writes 2, they took 3 from 5. Both numbers are added here. Count on 3 from 5.

3. 6 If your child writes 9, they added the 3 and 6 on the right. The missing number goes with the 3 on the left, so it must be 6 to make both sides match.

4. 16

D

1. 7 If your child writes 8, they believed Ali. Swapping the numbers does not change the answer. Start at 4 and count on 3: 5, 6, 7.

E

1. Look for: Two sums using the same two numbers in a different order, with the same answer, and a reason such as swapping the numbers does not change the total.

Words to use

Say“Which numbers did you swap, and did the answer change?”

Instead of“Just tell them the answer is 7 because that is the rule.”

After the sheet

Put 2 spoons and 5 forks on the table. Say both sums out loud, spoons first, then forks first, and see if they match.

Tick what your child got right in StudyDen. Anything missed comes back in a later Look back box, so there's no need to redo the sheet.

The rest of this unit

14 more sheets come with a StudyDen plan, in teaching order:

Pairs that make 10(with a plan)
Subtract using number pairs(with a plan)
One more, one less(with a plan)
Next-door numbers(with a plan)
Hopping by two(with a plan)
Hopping Odd Numbers(with a plan)
Neighbours in twos(with a plan)
Odd numbers two apart(with a plan)
Zero Changes Nothing(with a plan)
Doubles All Around Us(with a plan)
Halving undoes doubling(with a plan)
Doubles help near doubles(with a plan)
Five and a bit(with a plan)
Picture it, then calculate(with a plan)

Every Year 1 maths worksheet

The worksheets plan opens a printable sheet for every lesson in Years 1 to 6, each with its answers on a separate page for you. It costs £6.99 a month or £59 a year for the whole family, with no free trial.

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