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Adding and Subtracting Tens

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Adding and Subtracting Tens

Adding and Subtracting Tens

Tens blocks and number line illustration

🔢 Part 1: Using Adding Facts Within 10 to Add Whole Tens

1. If you know that 3 + 4 = 7, what is 30 + 40?
2. If you know that 5 + 2 = 7, what is 50 + 20?
3. Circle the correct answer:

If 6 + 3 = 9, then 60 + 30 = ?

63

90

93

36

4. Complete the pattern:

2 + 5 = 7, so 20 + 50 = _______

4 + 4 = 8, so 40 + 40 = _______

1 + 8 = 9, so 10 + 80 = _______

📊 Part 2: Tens and Ones Frame Adding

5. Draw tens blocks to show 30 + 20 in the frame below:

30 + 20 = _______

6. Use the tens and ones frame to solve:

Draw or write to show 40 + 30

Answer: _______

7. Show 25 + 30 using tens and ones:

25 + 30 = _______

➖ Part 3: Beginning to Use Subtracting Facts Within 10

8. If you know that 8 - 3 = 5, what is 80 - 30?
9. Complete these subtraction patterns:

9 - 4 = 5, so 90 - 40 = _______

7 - 2 = 5, so 70 - 20 = _______

6 - 1 = 5, so 60 - 10 = _______

10. Circle the correct answer:

If 10 - 6 = 4, then 100 - 60 = ?

46

40

64

106

🧮 Part 4: Problem Solving with Tens

11. Sarah has 40 stickers. She gives away 20 stickers. How many stickers does she have left?

Answer: _______ stickers

12. There are 30 children in one class and 50 children in another class. How many children are there altogether?

Answer: _______ children

13. Check all the number sentences that equal 70:

30 + 40

20 + 50

60 + 20

80 - 10

90 - 30

14. Show your thinking: How can knowing 4 + 5 = 9 help you solve 40 + 50?

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