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Subtraction Mastery Algorithms

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Subtraction Mastery Algorithms

Charlie, Layla and Matilda are preparing ingredients for a cooking class. Solve each subtraction using a written algorithm, an efficient mental strategy, or both. Line up the place values and show enough working to explain your method. Amounts are in grams unless stated otherwise.

Subtract without regrouping

Start with these ingredient quantities. Check each answer by adding the difference to the amount taken away.

1.The class has 586 g of oats and uses 243 g. How many grams of oats remain? Show your subtraction algorithm.

2.There are 748 g of apples. The class prepares 326 g for a recipe. How many grams of apples are left?

Regroup to subtract

When a place-value digit in the top number is too small, regroup from the next place-value column. Remember that 1 ten is 10 ones and 1 hundred is 10 tens.

3.A tub contains 532 g of flour. Layla uses 278 g. How many grams are left? Show where you regroup.

4.The class has 704 g of sugar and uses 368 g. Work out how much sugar remains. Be careful when regrouping across the tens column.

5.A recipe needs 459 g of strawberries. Matilda has 800 g. How many grams will be left after she measures out the amount needed?

Choose, check and explain

Use place value and the relationship between addition and subtraction to reason about your answers.

6.Charlie says 621 − 287 = 444. Which answer is correct?

7.A bowl has 900 g of pancake mix. After cooking, 475 g remains. How much mix was used? Write a subtraction equation and check it with addition.

8.Fill in the missing number: 653 − = 218. Explain how you found the missing amount.

9.True or false? In 500 − 268, you can regroup 1 hundred as 10 tens, then regroup 1 ten as 10 ones. Find the difference to support your answer.

TrueFalse

10.The class used 238 g of butter in the morning and 175 g in the afternoon. There were 600 g to start. How much butter remains? Write one equation and describe a strategy for working it out.