This document provides a lesson on adding and subtracting multiples of 10 to 2-digit numbers. Students practice problems like 10 + 30, 40 - 20, and 60 + 40. They recognize patterns, like 1 ten plus 3 tens equals 4 tens. Students explain that they can use number bonds to help add and subtract tens, like 4 tens subtract 2 tens equals 2 tens. They count in 10s and 20s from different starting points, noticing that the ones place changes while the tens place stays the same. The goal is for students to be able to add or subtract multiples of 10 to any number.

1. Year One
Maths | Year 2 | Addition and Subtraction | Addition and Subtraction Strategies | Lesson 5 of 8: All the Tens
Maths
Addition and Subtraction

3. Success Criteria
Aim
• I can add and subtract a multiple of 10 to and from any 2-digit number.
• I can apply number bonds to higher numbers.
• I can spot a pattern.
• I can explain the pattern and use it to help me.

4. Multiples of Ten
Spin the addition and subtraction spinner and the multiples of ten
spinner.
Perform the operation!
How quickly can you do it?

5. Multiples of Ten
+
-
10 + 30

6. Multiples of Ten
+
-
40 - 20

7. Multiples of Ten
+
-
60 + 40

8. Multiples of Ten
+
-
30 + 30

9. Multiples of Ten
+
-
80 - 60

10. Multiples of Ten
+
-
100 - 30

11. Multiples of Ten
+
-
90 + 10

12. Multiples of Ten
+
-
90 - 40

13. Multiples of Ten
+
-
40 + 40

14. Multiples of Ten
+
-
80 - 40

15. Pattern Builders
1 + 3 = 4
10 + 30 = 40
1 ten and 3 tens equals 4 tens.
Did you spot a
pattern to help
you?
We can use our number bonds to help us
add tens.

16. 60 + 40 = 100
30 + 30 = 60
90 + 10 = 100
40 + 40 = 80
Pattern Builders
Explain the
pattern for these
additions.

17. Pattern Builders
4 – 2 = 2
40 – 20 = 20
4 tens subtract 2 tens equals 2 tens.
Did you spot a
pattern to help
you?
We can use our number bonds to help us
subtract tens.

18. 40 – 20 = 20
80 – 60 = 20
100 – 30 = 70
90 – 40 = 50
80 – 40 = 40
Pattern Builders
Explain the
pattern for these
other
subtractions.

19. Counting in Tens
Describe what you notice.
What changes and what stays the same? Why does this happen?

20. Counting in Tens
Count in 10s starting from the number 10.
Describe what you notice.
What changes and what stays the same? Why does this happen?
10 20 30 40 50 60 70 80 90 100

21. Counting in Tens
Count in 10s starting from the number 4.
Describe what you notice.
What changes and what stays the same? Why does this happen?
4 14 24 34 44 54 64 74 84 94 104

22. Counting in Tens
Count in 10s starting from the number 10.
Describe what you notice.
What changes and what stays the same? Why does this happen?
9 19 29 39 49 59 69 79 89 99

23. Counting in Twenties
What do you think will happen if we
count in 20?
Will it be similar to counting in 10s?
Write down the pattern and explain it to the other children.
Explore:
• counting in 20s from 0
• counting back in 20s from 100
• counting in 20s from 10
• counting back in 20s from 88

24. Multiples Maze

25. One Hundred Square
Choose a number. Decide whether to add or subtract.
What do you notice?
Can you add and subtract a multiple of 10 to any number?
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100

26. Success Criteria
Aim
• I can add and subtract a multiple of 10 to and from any 2-digit number.
• I can apply number bonds to higher numbers.
• I can spot a pattern.
• I can explain the pattern and use it to help me.