Starter quiz
- Which of the following words is the same as add? Select all that apply.
- sum ✓
- minus
- total ✓
- increase ✓
- plus ✓
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- The temperature is 32℃. It decreases by 9℃. Tick the symbols that would be needed to write this as an equation.
- +
- − ✓
- x
- = ✓
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- The temperature is 12℃. It drops by 11℃. Which of the following unsolved equations matches the problem?
- 12 − 11 = ? ✓
- 11 − 12 = ?
- ? = 12 − 11 ✓
- 11 + 17 = ?
- 17 + 11 = ?
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- 32 − 17 = ______
- '15' ✓
- Which of the following mean 'subtract'?
- Take away ✓
- Add
- Minus ✓
- Remove ✓
- Combine
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- Match the word with its correct definition.
- equation⇔one number, calculation or expression is equal to another ✓
- difference⇔the result of subtracting one number from another ✓
- addition⇔finding the total, or sum, by combining two or more numbers ✓
- change⇔make something different ✓
Exit quiz
Describe the change.- Positive change
- Negative change ✓
- No change
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- Which of the these would result in a negative change to the number of marbles in the bag?
- Put eight in, take three out.
- Put three in, take eight out. ✓
- Add five, take away seven. ✓
- Add seven, take away five.
- Put five in, remove nine. ✓
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- Jun is adding in and taking out one pound coins from his piggy bank. Which of these would result in a negative difference to the amount of money in the piggy bank?
- Put £3 in, take £5 out. ✓
- Put £5 in, take £3 out.
- Add £7, take £9 out. ✓
- Add £9, take £7 out.
- Put £13 in, take £20 out. ✓
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- People are getting on and off a bus at different stops. The bus already has a number of passengers. Which of these would result in a negative change?
- Nine got on, 13 got off. ✓
- 13 got on, nine got off.
- Nobody got on, three got off. ✓
- Three got on, nobody got off.
- Nobody got on, nobody got off.
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- Jun and Sofia are playing the marbles game. They have used the equation 5 − 7 = −2. What does each of the numbers represent?
- 5⇔the number of marbles added to the bag ✓
- 7⇔the number of marbles taken out of the bag ✓
- −2⇔the change in the number of marbles ✓
- Jun adds £4 to his piggy bank and takes £6 out. Which of the following equations describes this?
- £6 − £4 = £2
- £4 − £6 = −£2 ✓
- −£2 = £4 − £6 ✓
- £4 − £2 = −£6
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Worksheet
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Presentation
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Lesson Details
Key learning points
- A change can be positive or negative.
- A change can be represented by a negative number.
Common misconception
Pupils believe that subtraction is commutative and therefore equations can be written in any order.
Model with physical resources such as marbles in a bag that 4 - 6 results in a negative change but 6 - 4 results in a positive change.
Keywords
Positive change - An overall amount has increased.
Negative change - An overall amount has decreased.
Negative number - Any value less than zero.
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