Year 5

Multiplying decimals using mental strategies

Year 5

Multiplying decimals using mental strategies

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Lesson details

Key learning points

  1. In this lesson, we will use doubling and round and adjust strategies to multiply decimal numbers. We will use doubling to multiply by two, four and eight and round and adjust in the context of money (e.g. £2.99 x 3).

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5 Questions

Q1.
18.2 x 3 =
34.6
Correct answer: 54.6
56.4
Q2.
5.3 x 8
0.424
4.24
Correct answer: 42.4
Others
Q3.
Priya travels 19.3 km every day. How far does she travel over four days?
72.4 km
Correct answer: 77.2 km
82.4 km
Q4.
Tickets for a show cost £23.67. How much do seven tickets cost?
£162.69
Correct answer: £165.69
£175.69
Q5.
Train tickets cost £7.93. If Steve, his wife and three children go on a trip, how much will it cost them?
£31.72
Correct answer: £39.65
£47.58

5 Questions

Q1.
Multiplying by four is the same as....
Doubling
Correct answer: Doubling and doubling again
Doubling, doubling again and then doubling again
Q2.
1.15 x 8 =
2.3
4.6
Correct answer: 9.2
Q3.
At the supermarket it costs £1.99 for one pack of berries. Which equation could I use to find out how much 6 packets were?
1 x 6
1.99 x 2 (double) and then the answer x 2 (double)
Correct answer: 2 x 6
Q4.
6.01 x 3
17.97
18
Correct answer: 18.03
Q5.
60.02 x 8 =
120.04
240.08
Correct answer: 480.16