Explain what each factor represents in a multiplication story when one of the factors is one | Maths

Starter quiz

Complete: 4 × 2 is equal to ______

'8' ✓
Select the correct number to complete the equation which represents the 10 pence and 5 pence coins. 2 × 10 = 4 × ___ p.

10

2

3

5 ✓
Look at the coins and complete with the same value. ______ × 2 p = 2 × ___ p.

'1' ✓
Which expression can be used to describe both sets of fingers?

1 × 5

2 × 5 ✓

2 × 2

1 × 10
Complete the multiplication equation needed to solve this problem. If one packet of sweets costs 10 p, how many packets cost 60 p? ______ packets × 10 p = 60 p.

'6' ✓
If one packet of sweets costs 10 p, how much does 8 packets of sweets cost? ______ p.

'80' ✓

Exit quiz

Look at the image. It shows ______ groups of 1

'5' ✓
10 times 1 can represent 10 groups of ______

'1' ✓
5 times 1 is equal to ______ group of 5

'1' ✓
Which grouping of coins shows 1 group of 10?

ten 1 pence coins ✓

one 1 pence coin

one 10 pence coin ✓

two 5 pence coins

four 10 pence coins
Match the expression to the correct description.

2 × 1

⇔

1 group of 2 ✓

3 × 5

⇔

5 groups of 3 ✓

10 × 1

⇔

1 group of 10 ✓

5 × 7

⇔

7 groups of 5 ✓

7 × 2

⇔

2 groups of 7 ✓
Aisha has 2 of the same coin. Laura has one coin. She has the same amount of money as Aisha. If Aisha’s coins are both 10 pence, what is Laura’s coin? ______ p.

'20 ' ✓

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Lesson Details

Key learning points

When there are two factors and one is equal to 1 then the product is equal to the other factor.
1 can represent the group size or the number of groups.
Identify the group size and the number of groups in the multiplication story.

Common misconception

Pupils may not recognise that 1 can be a factor, particularly when the context includes 1 group.

Work with children to discuss groups and what they can see, such as 3 groups of 4 Reduce the number of groups to 2 and then 1 group and identify that 1 group can still be used. Then attach this to multiplication and expressions.

Keywords

Factor - A factor is a number which exactly divides another whole number.
Product - A product is the result of two or more numbers multiplied together.