Using redistribution with addition of decimal fractions | Maths

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' ✓

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

<

=

> ✓

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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.

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.

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.