Multiplying with decimals | Maths | Quizalize & Oak National Academy

Starter quiz

A ______ is a term which exactly divides another term.
- 'factor' ✓
Match the multiplication of these integers with their answers
- $6\times4$
  
  ⇔
  
  24 ✓
- $6\times5$
  
  ⇔
  
  30 ✓
- $9\times2$
  
  ⇔
  
  18 ✓
- $8\times4$
  
  ⇔
  
  32 ✓
Complete the calculation: $6\times$ ______ $= 600$
- '100' ✓
Divide 1 into 10 equal parts. What does each part represent as a decimal?
- 0.00001
- 0.001
- 0.1 ✓
- 1
Divide 1 into 100 equal parts. What does each part represent as a decimal?
- 0.1
- 0.01 ✓
- 0.001
- 0.0001
Without using a calculator, work out: $2.4+1.28+0.3+0.13=$ ______
- '4.11' ✓

A __________ is the result of two or more numbers multiplied together.
- product ✓
- factor
- multiple
- prime
Which of these is equivalent to 6.34?
- $634\times0.1$
- $634\times0.01$ ✓
- $634\times0.001$
- $634\times10$
Dividing by 1000 is equivalent to __________
- $\times0.1$
- $\times0.01$
- $\times0.001$ ✓
- $\times0.0001$
Which of these is equivalent to $4.56\times2.3$ ?
- $456\times23\times0.1$
- $456\times23\times0.01$
- $456\times23\times0.001$ ✓
- $456\times23\times10$
Work out: $5.8\times2.9=$ ______
- '16.82' ✓
Using your knowledge on identifying a reasonable answer and without working out, match the calculation to the correct answer.
- $2.4\times8.4$
  
  ⇔
  
  20.16 ✓
- $2.9\times2.5$
  
  ⇔
  
  7.25 ✓
- $11.3\times3.1$
  
  ⇔
  
  35.03 ✓
- $5.7\times0.2$
  
  ⇔
  
  1.14 ✓

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When pupils multiply decimals, they use the column method and align the decimal points.

If the column method is used, encourage integer multiplication and use of powers of 10 to adjust the answer to the original calculation.

Factorising - Factorising means to express a term as the product of its factors.