Starter quiz
What is the missing part in this bar model?- '760' ✓
- Complete: 327 + 99 = ______
- '426' ✓
- Jun buys two packs of oranges which cost £1.49 each. How much does he spend altogether? £______
- '2.98' ✓
- Sofia has £10 to spend. She buys a souvenir bear for £4.50 How much change should she receive? £______
- '5.50' ✓
- Sam thinks of a 2-digit number. She adds 7 before halving it to finish with the number 25 What was her starting number?
- 41
- 42
- 43 ✓
- 44
-
What is the missing part in this bar model?- '425' ✓
Exit quiz
Is the question mark on the bar model a part or whole?- part
- whole ✓
-
- Use the mental strategy of redistribution to calculate the whole. 3.1 + 3.6 = ______
- '6.7' ✓
- Use the mental strategy of redistribution to calculate the whole. 5.9 + 6.6 = ______
- '12.5' ✓
- Use the mental strategy of redistribution to calculate the whole. 4.99 + 3.45 = ______
- '8.44' ✓
- Which of the following additions do you think was most likely to have been solved using redistribution?
- 1.97 + 2.56 = 4.53 ✓
- 3.47 + 6.12 = 9.59
-
- Which inequality symbol should be placed between these two addition expressions? Use redistribution to help. 2.02 + 5.79 ______ 5.81 + 1.95
- <
- =
- > ✓
-
Worksheet
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Presentation
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Lesson Details
Key learning points
- If one part is increased and the other is decreased by the same amount, the whole stays the same.
- If one part is decreased and the other is increased by the same amount, the whole stays the same.
- Redistributing between parts with the whole staying the same is sometimes known as the 'same sum' rule.
Common misconception
Children may struggle to not immediately rush to making use of a written method such as columns addition.
Encourage the children to be resilient and remind them that practice makes perfect.
Keywords
Redistribution - Redistribution is where part of one addend is moved to another addend. It is sometimes known as the same sum rule.
Decimal fraction - A decimal fraction is a fraction written as a decimal. A decimal point separates whole numbers from decimal fractions.
Whole - The whole is all the parts or everything, the total amount.
Part - A part is some of the whole.
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