7 . multiplication table

**Lesson 1:** Mental arithmetic

7 x 1 = 1 x 7 = 7 x 2 = 2 x 7 = |
7 x 3 = 3 x 7 = 7 x 4 = 4 x 7 = |
7 x 5 = 5 x 7 = 7 x 6 = 6 x 7 = |
7 x 0 = 0 x 7 = 7 x 9 = 7 x 10 = |

**Solution guide: **

7 x 1 = 7 1 x 7 = 7 7 x 2 = 14 2 x 7 = 14 |
7 x 3 = 21 3 x 7 = 21 7 x 4 = 28 4 x 7 = 28 |
7 x 5 = 35 5 x 7 = 35 7 x 6 = 42 6 x 7 = 42 |
7 x 0 = 0 0 x 7 = 0 7 x 9 = 63 7 x 10 = 70 |

*Comment:*

- Any number when multiplied by

$0$equal to

$0$ - Any number when multiplied by equal to itself
- When swapping the factors in a product, the product does not change

**Lesson 2:** Calculate

a) 7 x 4 + 12 b) 7 x 8 +14

7 x 9 + 17 7 x 7 + 31

**Solution guide:**

Do multiplication first, addition later

a) 7 x 4 + 12 = 28 + 12 = 40 b) 7 x 8 +14 = 56 + 14 = 70

7 x 9 + 17 = 63 + 17 = 80 7 x 7 + 41 = 49 + 41 = 90

**Lesson 3:** Each pen box contains 7 pencils. How many pencils are there in 6 such pens?

**Solution guide:**

*Summary*

1 box contains: 7 pencils

6 boxes contain: … a pencil?

*Solution*

The 6 pencil cases with the number of pencils are:

7 x 6 = 42 (tree)

Answer: 42 pencils

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