Multiply tenths by whole numbers | Maths | Quizalize & Oak National Academy

Starter quiz

Continue this sequence: 8 ones, 9 ones, 10 ones, ___ ones
- '11' ✓
Match the equations to their sum.
- 3 + 3 + 3 =
  
  ⇔
  
  9 ✓
- 5 + 5 =
  
  ⇔
  
  10 ✓
- 2 + 2 + 2 + 2 =
  
  ⇔
  
  8 ✓
- 4 + 4 + 4 + 4 =
  
  ⇔
  
  16 ✓
- 6 + 6 + 6 =
  
  ⇔
  
  18 ✓
Match the factors to their product.
- 9 × 4 =
  
  ⇔
  
  36 ✓
- 6 × 4 =
  
  ⇔
  
  24 ✓
- 8 × 4 =
  
  ⇔
  
  32 ✓
- 0 × 4 =
  
  ⇔
  
  0 ✓
- 1 × 4 =
  
  ⇔
  
  4 ✓
0.5 cm = ______ mm
- '5' ✓
Match the equation to the missing factor.
- 3 × ___ = 21
  
  ⇔
  
  7 ✓
- 4 × ___ = 12
  
  ⇔
  
  3 ✓
- ___ × 5 = 30
  
  ⇔
  
  6 ✓
- ___ × 2 = 18
  
  ⇔
  
  9 ✓
- 7 × ___ = 56
  
  ⇔
  
  8 ✓
Which of these are multiples of six?
- 12 ✓
- 28
- 36 ✓
- 46
- 62

What comes next in this sequence? 0.8, 0.9, 1.0, ______?
- '1.1' ✓
How many tenths is 0.5 composed of?
- '5' ✓
If 7 × 8 = 56, what does 7 × 0.8 equal?
- 560
- 56
- 5.6 ✓
- 0.56
Match the equation to its answer.
- 4 × 0.9 =
  
  ⇔
  
  3.6 ✓
- 5 × 0.5 =
  
  ⇔
  
  2.5 ✓
- 3 × 0.7 =
  
  ⇔
  
  2.1 ✓
- 0.1 × 1 =
  
  ⇔
  
  0.1 ✓
- 0 × 0.9 =
  
  ⇔
  
  0 ✓
Lucas is making a line of marbles. Each marble is 0.8 cm long. How long could it be?
- 3.2 cm ✓
- 2.2 m
- 1.6 cm ✓
- 1.2 cm
- 8 cm ✓
Sofia has a blue ribbon that is six metres long. She also has a red ribbon that is two-tenths times the length of the blue ribbon. How long is the red ribbon? ______ m
- '1.2' ✓

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There are 10 tenths in one whole.
Unitising can help to multiply tenths by whole numbers.
Multiplication of tenths can be represented as repeated addition of tenths.
‘___ times ___ ones is equal to ___ ones so ___ times ___ tenths is equal to ___ tenths’ supports us to multiply tenths.

Children may incorrectly write the amount of tenths e.g. 49 tenths may be written as 0.49

There are ten tenths in one whole. So e.g. 49 tenths is composed of 4 ones and 9 more tenths. We write this as 4.9