Multiplying decimals using mental strategies
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Lesson details
Key learning points
- 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
56.4
Q2.
5.3 x 8
0.424
4.24
Others
Q3.
Priya travels 19.3 km every day. How far does she travel over four days?
72.4 km
82.4 km
Q4.
Tickets for a show cost £23.67. How much do seven tickets cost?
£162.69
£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
£47.58
5 Questions
Q1.
Multiplying by four is the same as....
Doubling
Doubling, doubling again and then doubling again
Q2.
1.15 x 8 =
2.3
4.6
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)
Q4.
6.01 x 3
17.97
18
Q5.
60.02 x 8 =
120.04
240.08