Use addition and subtraction to solve problems in different contexts | Maths

Starter quiz

Complete the missing word _______ − subtrahend = difference
- difference
- addend
- minuend ✓
- subtrahend
What is the missing part in this bar model?
- '30' ✓
Which of the pairs of numbers have a difference of 60?
- 270 and 290
- 230 and 310
- 260 and 320 ✓
- 250 and 280
Which of these is the correct equation represented by this number line?
- 380 + 320 = 60
- 320 = 380 − 60 ✓
- 320 − 60 = 380
- 380 = 320 − 60
Look at the number line. Which number is missing from the equation? 670 − 150 = ______
- '520' ✓
Look at the number line. Which number is missing from the equation? 220 + ______ = 480
- '260' ✓

Exit quiz

Choose the correct equation for this word problem: Laura has baked 15 cupcakes. She gives 7 of them to her friends. How many does she have left?
- 15 − 7 = 8 ✓
- 7 + 8 = 15
- 7 − 15 = 8
- 7 + 15 = 8
Use an efficient strategy to solve this problem: In one year, the local council plants 420 trees. The next year, they plant 190 more. How many trees have been planted over the two years? ______ trees
- '610' ✓
Use an efficient strategy to solve this problem: In a science experiment, Aisha makes 440 g of slime. Laura makes 270 g of slime. They mix their slime together. How much slime is there now? ______ g
- '710' ✓
Use an efficient strategy to solve this problem: Aisha pours herself 330 ml of squash. Laura kindly pours in 95 ml more before Aisha drinks 58 ml. How much squash does she have left? ______ ml
- '367' ✓
What is the top value of the top brick in this addition pyramid?
- '500' ✓
Find the missing number in the magic addition square. All the rows, columns and diagonals add up to 300
- '80' ✓

Worksheet

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Lesson Details

Key learning points

By looking carefully at the numbers involved, you can choose the most efficient strategy.
When numbers are close together, finding the difference is the most efficient strategy.
Sometimes, we can use known addition facts to make finding the difference even more efficient.

Common misconception

On the magic squares, children will often miss the fact that it is a two step problem involving addition and subtraction. They may think you have to add the two numbers in the row/column or diagonal.

Start with a simpler magic square. The easier ones feature the numbers 1-9 and total 15 diagonally, vertically or horizontally. Once they understand them, introduce 2-digit and 3-digit magic squares.

Keywords

Minuend - The minuend is the number being subtracted from.
Subtrahend - A subtrahend is a number subtracted from another.
Difference - The difference is the result after subtracting one number from another.
Partition - Partition is the act of splitting an object or value down into smaller parts.