Year 4
Year 4

Mental Addition and Subtraction

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Lesson details

Key learning points

  1. In this lesson, we will use mental calculation strategies to add and subtract decimal numbers.

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6 Questions

Q1.
Which addition expression matches 231.5
200 + 30 + 0.5
Correct answer: 200 + 30 + 1 + 0.5
200 + 30 + 1 + 5
Q2.
If 1 is the whole and 0.8 is a part, what is the other part?
0.1
Correct answer: 0.2
2
8
Q3.
If 5 is the whole and 2.1 is a part, what is the other part?
0.9
Correct answer: 2.9
29
5.9
Q4.
If 10 is the whole and 7.3 is a part, what is the other part?
Correct answer: 2.7
27
3.7
37
Q5.
If 10 is the whole and 1.6 is a part, what is the other part?
0.4
10
Correct answer: 8.4
9.4
Q6.
If 10 is the whole and it is made of 3 parts. What could the parts be?
1.5 + 2.3 + 5.2
2.6 + 3.3 + 5.1
Correct answer: 4.1 + 4.4 + 1.5

6 Questions

Q1.
Which addition expression matches 653.3
Correct answer: 600 + 50 + 3 + 0.3
600 + 50 + 3 + 3
600 + 50 + 3 + 3.5
Q2.
What is 4 tenths add 3 tenths?
7 ones
7 tens
Correct answer: 7 tenths
Q3.
What is 9 tenths subtract 4 tenths?
5
5 ones
Correct answer: 5 tenths
Q4.
What is 0.8 add 0.6
0.14
Correct answer: 1.4
14
Q5.
What is 1.6 - 0.7?
Correct answer: 0.9
1
9
Q6.
What is 0.9 add 9 tenths?
0.99
Correct answer: 1.8
9.9