Starter quiz
- What multiplication equation does this array represent?
- 4 × 2 = 16
- 4 × 4 = 16 ✓
- 16 × 4 = 16
-
- What is the missing factor in this image?
- '10' ✓
- Which of these are correct arrays for 12?
- Which of these make a rectangle with an area of 32 cm ?
- 30 cm + 2 cm =
- 4 cm × 8 cm = ✓
- 1 cm × 32 cm = ✓
- 5 cm × 6 cm =
- 3 cm × 2 cm =
-
- Complete the missing factor: 12 × ______ = 60
- '5' ✓
- Complete: 72 ÷ ______ = 9
- '8' ✓
Exit quiz
- Look at the rectangle on the grid. What is being represented?
- 28 × 7 = 4
- 7 × 4 = 28 ✓
- 4 × 7 = 28 ✓
- 4 × 28 = 7
-
- Look at the rectangle on the grid. What other factor pairs would make a rectangle covering the same area?
- 20 and 8
- 1 and 28 ✓
- 10 and 18
- 8 and 3
- 2 and 14 ✓
-
- Which of these are factors of 48?
- 1 ✓
- 12 ✓
- 40
- 48 ✓
- 96
-
- Which factor is missing from the factor bug?
- '10' ✓
- What number is represented by the factor bug?
- '30' ✓
- What number is represented by the incomplete factor bug?
- '32' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- All numbers have themselves and 1 as factors.
- Listing factors in order helps identify all the factors for a given number.
Common misconception
Pupils do not know when to stop looking for more factors.
Build up finding factors of numbers systematically by arranging into rows and columns, starting with 1 row. Encourage pupils to generalise that when the number of rows becomes larger than the number of columns, you can stop looking for factors.
Keywords
Factor - Factors are whole numbers which exactly divide another whole number.
Systematic - Being systematic, means working in a set way, often according to a fixed plan.
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