Applying mental calculation strategies to adding and subtracting decimals

Applying mental calculation strategies to adding and subtracting decimals

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Lesson details

Key learning points

  1. In this lesson, we will use a range of informal mental strategies to add and subtract decimal numbers.

Licence

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4 Questions

Q1.
True or False: 1.356 - 0.999 = 0.356
Correct answer: False
True
Q2.
True or false: 134.76 - 82.5 = 52.76
Correct answer: False
True
Q3.
True or false: 24.56 - 19.9 = 4.66
False
Correct answer: True
Q4.
True or false: 46.78 - 3.8 = 42.99
Correct answer: False
True

6 Questions

Q1.
6.3 + 12.27
1.857
Correct answer: 18.57
18.75
Q2.
2.89 - 1.41 =
0.148
Correct answer: 1.48
14.8
Q3.
7.3 + 7.2 =
1.45
Correct answer: 14.5
5.14
Q4.
2.671 + 5.999
Correct answer: 8.67
8.761
86.71
Q5.
4.53 - 4.49
0.004
Correct answer: 0.04
0.4
Q6.
1.82 + 4.08
5.09
Correct answer: 5.9
5.91

Lesson appears in

UnitMaths / Calculating with whole numbers and decimals