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Adding Without Renaming

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Adding Without Renaming

Adding Without Renaming

Bundles of sticks and number disks for addition

🔢 Part 1: Adding Two-Digit Numbers

1. Solve these addition problems. Show your working in the box below each problem.

a) 53 + 21 = _____

b) 47 + 32 = _____

c) 64 + 25 = _____

d) 31 + 46 = _____

➖ Part 2: Subtracting Two-Digit Numbers

2. Solve these subtraction problems. Show your working in the box below each problem.

a) 75 - 32 = _____

b) 85 - 42 = _____

c) 90 - 58 = _____

d) 68 - 24 = _____

📊 Part 3: Number Line Practice

3. Use the number line to solve 43 + 26. Draw your jumps on the number line below.

43 + 26 = _____

4. Use the number line to solve 72 - 31. Draw your jumps on the number line below.

72 - 31 = _____

🤔 Part 4: Estimation and Reasoning

5. Before solving, estimate if the answer will be reasonable. Circle your estimate, then solve.

56 + 23 = ?

My estimate: The answer will be about _____ (between 70-90)

About 70

About 80

About 90

Now solve: 56 + 23 = _____

6. Check all the strategies you could use to solve 45 + 34:

Bundles of sticks

Number disks

Number line

Mental maths

📝 Part 5: Word Problems

7. Read each word problem carefully and solve.

a) Sarah has 42 stickers. Her friend gives her 27 more stickers. How many stickers does Sarah have altogether?

Number sentence: _____ + _____ = _____

Answer: Sarah has _____ stickers altogether.

b) There were 86 books in the library. The librarian lent out 35 books. How many books are left in the library?

Number sentence: _____ - _____ = _____

Answer: There are _____ books left in the library.

💭 Part 6: Explain Your Thinking

8. Explain how you would solve 54 + 35 using bundles of sticks and number disks.
9. Draw a picture to show how you would solve 67 - 23 using any method you choose.
10. Fill in the missing numbers:

When I add _____ tens and _____ units to _____ tens and _____ units, I get 79.

One possible answer: _____ + _____ = 79

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