Spot the Pattern, Use the Rule

Mathematics · Mathematical Thinking · ages 6-7

Name ______________________ Date ____________

Double 9 is 18. Use it for 9 plus 10. What is 9 plus 10?
Answer: ______________
If 7 + 7 = 14, what is 7 + 8?
- 14
- 15
- 16
This pattern goes up by 2 each time: 2, 4, 6, 8.
Circle one: True False
Every time you subtract 10 from a two-digit number, what happens to the tens digit?
- It goes down by 1
- It goes up by 1
- It stays the same
Starting at 5, each time you add 5, the ones digit does what?
- stays at 5
- counts 1, 2, 3
- becomes even
- 0 then 5
What is 62 take away 10?
Answer: ______________
What is 47 take away 10?
Answer: ______________
Start at 5 and add 5 two times. Where do you land?
- 10
- 15
- 20
- 12
Zoe knows 5 + 5 = 10. She says 5 + 6 = 12 because she added 2. What did Zoe get wrong?
- She used the wrong doubles fact
- Her answer is actually correct
- She added 2 instead of 1
Zoe says taking 10 from 73 changes the ones digit too. Is Zoe right?
Circle one: True False

Answer key

For grown-ups. Fold this page away before handing over the rest.

19 · 10 is one more than 9, so 9 plus 10 is 18 plus 1, or 19.
15 · 7 + 8 is one more than 7 + 7. So 14 + 1 = 15.
True · Each number is 2 more than the one before it, so the rule is add 2.
It goes down by 1 · Subtracting 10 changes only the tens digit. It always drops by 1, while the ones digit stays the same.
0 then 5 · Adding 5 makes the ones digit switch between 5 and 0.
52 · Tens drop from 6 to 5.
37 · Only the tens digit drops by 1.
15 · The first jump reaches 10 and the second reaches 15.
She added 2 instead of 1 · 5 + 6 is only one more than 5 + 5, so it should be 11. Zoe added 2 by mistake.
False · Taking 10 changes the tens digit, but the ones digit stays 3. The result is 63.