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Adding Subtracting Parts

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Adding Subtracting Parts

Ruben, Freya and Isla are travelling by ferry. Use number parts—such as tens and ones, or the amount needed to reach the next ten—to solve each problem. Show your thinking where asked.

Make the next ten

Break one addend into useful parts to make a ten first.

1.Ruben spots 27 seabirds, then 8 more fly past. Complete the parts strategy: 27 + 8 = 27 + + = 30 + = .

2.Freya counts 36 passengers on the lower deck and 7 on the upper deck. Which breakdown makes a ten first?

36 + 1 + 6
36 + 3 + 4
36 + 5 + 2
36 + 4 + 3

3.The ferry has 48 life jackets ready. The crew brings 26 more aboard. Split 26 into tens and ones, then calculate 48 + 26.

Subtract in helpful parts

Take away a number in steps. You might subtract to the nearest ten, then finish the subtraction.

4.Isla has 32 minutes before the ferry leaves. She has already waited 7 minutes. Complete: 32 − 7 = 32 − − = 30 − = .

5.There are 63 passengers aboard. At the next stop, 28 get off. Work out 63 − 28 by subtracting tens and then ones. Show your steps.

6.The number line shows a passenger count starting at 39. Use the jump to 40, then the remaining jump, to find 39 + 6.

Ferry-trip puzzles

Choose a sensible way to split each number. Check that your answer makes sense.

7.The ferry shop starts with 75 cups. It sells 19 cups during the crossing. Calculate 75 − 19 by taking away 20 and adding 1 back.

8.True or false? To calculate 58 + 27, you can split 27 into 20 and 7: 58 + 20 = 78, then 78 + 7 = 85.

True
False

9.Freya says 52 − 18 = 52 − 10 − 8 = 34. Is she correct? Explain your answer and give the correct answer.

10.Ruben counts 46 blue seats and 38 red seats. Find the total by splitting 38 into 30 and 8. Then explain why adding the parts gives the same total as adding 38 at once.

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About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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