Starter quiz
- Which numbers in the equation are addends? 28 + 26 = 54
- 54
- 28 ✓
- 26 ✓
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- What number is the sum in this equation? 76 = 60 + 16
- '76' ✓
What sum is missing from this bar model?- '55' ✓
- Match the sum and the addends.
- 70 + 30 =⇔100 ✓
- 73 + 20 =⇔93 ✓
- 30 + 30 =⇔60 ✓
- 70 + 70 =⇔140 ✓
- Which other addition equations match this calculation? 150 + 70 = 220
- 70 + 150 = 220 ✓
- 220 = 70 + 150 ✓
- 220 − 70 = 150
- 220 = 150 + 70 ✓
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- Which equations have a sum of 200?
- 100 + 100 = ✓
- 150 + 60 =
- 110 + 110 =
- 125 + 75 = ✓
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Exit quiz
- What number is the subtrahend in this equation? 36 − 16 = 20
- 36
- 20
- 16 ✓
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- Match the names to the numbers in this equation: 125 − 50 = 75
- subtrahend⇔50 ✓
- difference⇔75 ✓
- minuend⇔125 ✓
What number is missing from the bar model?- '290' ✓
- Match the addition and subtraction equations by looking for the same whole and the same parts.
- 60 + 90 = 150⇔150 − 60 = 90 ✓
- 130 = 90 + 40⇔90 = 130 − 40 ✓
- 80 + 50 = 130⇔130 − 80 = 50 ✓
- 150 = 80 + 70⇔80 = 150 − 70 ✓
Which equations are represented by the bar model?- 50 + 54 = 104 ✓
- 104 − 54 = 50 ✓
- 104 = 52 + 52
- 54 = 104 − 50 ✓
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Which equations could be represented by this bar model?- 120 = 250 − 130 ✓
- 250 + 20 = 270
- 250 = 350 − 100
- 250 = 110 + 140 ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Equations can be represented using part-part-whole or bar models
- The sum in an addition and the minuend in a subtraction both represent the whole
- The addends in an addition and the subtrahend and difference in a subtraction both represent parts
Common misconception
Pupils may find it more difficult to understand equations that start with the whole (e.g. 20 = 50 - 30)
Emphasise the need for balance in equations. To be equal, both sides must have the same value.
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.
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