Multiply 1-digit numbers by decimals
I can explain how to use multiplying and dividing by 10 or 100 to multiply 1-digit numbers by decimal fractions.
Multiply 1-digit numbers by decimals
I can explain how to use multiplying and dividing by 10 or 100 to multiply 1-digit numbers by decimal fractions.
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Lesson details
Key learning points
- Use place value to convert the decimal fraction by multiplication to a whole number.
- Use unitising, known facts and/or the distributive law to multiply the whole numbers.
- Use place value to convert the number by division to adjust the product.
Keywords
Unitising - Treating groups that contain the same number of things as ‘ones’ or ‘units’. It is important particularly in handling money and in understanding place value and supports us to think multiplicatively.
Distributive law - The distributive law says that multiplying a number by a group of numbers added together is the same as doing each multiplication separately.
Common misconception
Children may scale the decimal fraction inaccurately or may forget to scale the product accordingly to solve the original equation.
If a decimal fraction has only tenths, we multiply by 10 to form a whole number. If the decimal fraction has hundredths, we multiply by 100 to form a whole number. Remember to adjust the product to answer the original equation.
To help you plan your year 5 maths lesson on: Multiply 1-digit numbers by decimals, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 5 maths lesson on: Multiply 1-digit numbers by decimals, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 2 maths lessons from the Calculating with decimal fractions unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
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Starter quiz
6 Questions
30
140
1030
21
5
4
15
1.5
0.4
0.04
53 ÷ 10
53 ÷ 100
53 ÷ 1
5.3 ÷ 10
5.3 ÷ 100
Exit quiz
6 Questions
0.32
0.42
4.5
1.2
2.4