Starter quiz
- Tick the factors of 84.
- 1 ✓
- 2 ✓
- 4 ✓
- 8
- 10
-
- How many factors does the number 14 have?
- '4' ✓
- Complete the sentence. If a box is 36 cm long, 4 cm wide and 3 cm deep then it has a volume of ______ m.
- '432' ✓
- Which box has the greatest volume?
- A box of rice has a length of 10 cm. The volume of the pack is 720 cm. What could the width and height of the box be?
- 70 cm and 2 cm
- 6 cm and 12 cm ✓
- 8 cm and 9 cm ✓
- 10 cm and 72 cm
-
- The volume of a drawer is 240 cm. The height is 6 cm. What could the length and width be?
- 4 and 10 ✓
- 24 and 10
- 2 and 20 ✓
- 8 and 5 ✓
-
Exit quiz
Which image matches this expression? 2 × (3 × 4)- A
- B ✓
- C
-
A gardener is planting seeds to grow some leeks. She uses 5 of the pictured trays to plant the seeds. In each tray cell, she plants 4 seeds. How many leeks could she grow altogether?- '80' ✓
- Jacob spends 25 minutes a day reading. He does this for all 30 days in April. How many minutes did Jacob read for in April? Which calculation gives the correct answer?
- 30 × 5 × 5 = ✓
- 3 × 5 × 5 =
- 25 × 5 × 5 =
- 25 × 6 × 5 = ✓
-
Cupcakes are baked on 6 of these trays. Each cupcake is sold for £3.00 If all the cupcakes sell. How much money will be made? £______- '216' ✓
- What could the missing factors be? ___ × ___ × 30 = 360
- 3 and 5
- 3 and 4 ✓
- 6 and 2 ✓
- 4 and 4
-
- ___ × ___ × 2 = 168 Tick all the other numbers that could be the other factors.
- 3 ✓
- 5
- 6 ✓
- 12 ✓
- 14 ✓
-
Worksheet
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Presentation
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Lesson Details
Key learning points
- To simplify a multiplication calculation, you can change the order of the factors.
- To simplify a multiplication calculation you can group the factors in different ways.
Common misconception
Pupils struggle to solve unknown factor calculations where the volume is known.
Ensure pupils record missing factor problems as a multiplication equation. You may choose to build up the number of missing factors from one to two. You may also choose to build up from a missing factor in a 2 factor equation to a 3 factor equation.
Keywords
Associative - The associative law states that it doesn't matter how you group or pair values (i.e. which we calculate first), the result is still the same. It applies for addition and multiplication.
Commutative - The commutative law states that you can write the values of a calculation in a different order without changing the calculation; the result is the same. It applies for addition and multiplication.
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