Solve problems using the relationship between 3 and 9 times table | Maths

Starter quiz

Which of these is the definition of a triangle?
- A polygon with 4 sides and 4 vertices.
- A polygon with 3 sides and 3 vertices. ✓
- A 3D shape with triangular faces.
Match the expressions to the product.
- 3 × 6
  
  ⇔
  
  18 ✓
- 3 × 7
  
  ⇔
  
  21 ✓
- 3 × 8
  
  ⇔
  
  24 ✓
- 3 × 9
  
  ⇔
  
  27 ✓
- 3 × 12
  
  ⇔
  
  36 ✓
Match the groups of threes to the groups of 9 with the same value.
- 6 groups of 3
  
  ⇔
  
  2 groups of 9 ✓
- 3 × 9
  
  ⇔
  
  9 groups of 3 ✓
- 3 groups of 12
  
  ⇔
  
  4 × 9 ✓
- 3 × 15
  
  ⇔
  
  5 groups of 9 ✓
Complete: 9 × 4= ______
- '36' ✓
True or false? All multiples of 3 are multiples of 9
- True
- False ✓
Izzy organises her guinea cards into 4 groups of 9 She then sorts them into groups of 3 How many groups of 3 does she make?
- '12' ✓

Exit quiz

Select the multiples of 3
- 5
- 12 ✓
- 18 ✓
- 29
- 39 ✓
Identify the multiples of 9
- 8
- 26
- 27 ✓
- 35
- 72 ✓
True or false? 7 × 3 = 6 × 3 + 3
- True ✓
- False
Izzy makes three nonagons using straws for the sides. How many triangles could she make with the same number of straws? ______ triangles
- '9' ✓
What calculation is correct for this worded problem? If Izzy sliced a ribbon into four 9 cm pieces, how many 3 centimetre slices would she be able to cut?
- 4 × 9 = 36 So 27 3 cm pieces
- 4 × 9 = 36 So 12 3 cm pieces ✓
- 3 × 6 = 18 So 18 3 cm pieces
A baker baked 108 pastries and cakes altogether. He can put them in 12 boxes of 9 If he puts them into boxes of 3 how many boxes will he need? ______ boxes
- '36' ✓

Worksheet

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Lesson Details

Key learning points

Multiples of 3 are also multiples of 9
In any product in the 9 times table, there will always be three times the number of 3s as there are 9s

Common misconception

Pupils may find it difficult to solve problems or misunderstand questions.

Model clearly how to identify key phrases and words which will identify the operation and equation required for word problems. This could involve drawing bar models or other representations.

Keywords

Product - A product is the answer when two or more numbers are multiplied together.