Starter quiz
- 140 - 60 = 80. Which number is the minuend in this equation?
- 140 ✓
- 60
- 80
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- 140 - 60 = 80. 60 in this equation is the ______.
- minuend
- subtrahend ✓
- difference
-
- Which is the best way to partition the subtrahend in this equation? 150 - 70 = 80
- Partition 70 into 10 and 60
- Partition 70 into 30 and 40
- Partition 70 into 50 and 20 ✓
-
- What number is missing from this calculation? 120 − 70 = 120 − 20 − ______.
- '50' ✓
- Which partitioned subtrahend will help you to bridge 100?
- 150 - 90⇔90 = 50 + 40 ✓
- 180 - 90⇔90 = 80 + 10 ✓
- 140 - 50⇔50 = 40 + 10 ✓
- 120 - 50⇔50 = 20 + 30 ✓
- Match the missing subtrahends.
- 150 − _ = 90⇔60 ✓
- 140 − _ = 90⇔50 ✓
- 130 − _ = 90⇔40 ✓
- 120 − _ = 90⇔30 ✓
Exit quiz
Match the amounts to the correct words in this bar model.- 90 p⇔part ✓
- 140 p⇔whole ✓
Look at the bar model. How is the missing number calculated?- 120 ml - 60 ml ✓
- 120 ml + 60 ml
- 60 ml + 120 ml
- 60 ml - 120 ml
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Read the word problem. Jacob has 170 cm of ribbon. Andeep cuts 70 cm from the ribbon. Izzy cuts 50 cm from the ribbon. How is the missing part calculated?- 70 cm + 50 cm
- 170 cm - 70 cm - 50 cm ✓
- 170 cm + 70 cm + 50 cm
- 170 cm - 70cm
- 170 cm - 50 cm
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- Read the word problem. Andeep needs 150 grams of flour to bake a cake. There are 60 grams in one bag of flour and 80 grams in another bag. How much more flour does Andeep need? ______ grams.
- '10 ' ✓
- Jacob used partition and bridge through 100 as his strategy to solve 150 p - 70 p. Order the steps using his strategy.
- 1⇔Partition 70 p into 50 p and 20 p
- 2⇔150 p - 50 p = 100 p
- 3⇔100p - 20 p = 80 p
- Izzy collected rainwater outside in a jug. In week 1, there was 60ml of rain. In week 2, there was 10ml more than in week 1. How much rainwater did Izzy collect? ______ ml.
- '130 ml' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Representations help to identify the calculation needed to solve a problem.
- Different strategies can be applied to solve different problems.
- Evaluating or discussing strategies helps to find the most efficient one.
Common misconception
Pupils not understanding what the problem is asking them to find out and identifying the operation.
Model the use of bar models and manipulatives to represent the problem and how to identify the operation and calculations needed.
Keywords
Add - Bringing two or more numbers or things together to make a new total.
Subtract - Taking one number from another.
Strategy - A way to solve a problem.
Part - A piece or section of a whole.
Whole - All of a group or number.
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