**Multiplication by 10**

To multiply a number by 10, we simply put a zero to the right of the number.

1 × 10 = 10

2 × 10 = 20

3 × 10 = 30

4 × 10 = 40

5 × 10 = 50

6 × 10 = 60

7 × 10 = 70

8 × 10 = 80

9 × 10 = 90

**Multiplication by 20**

To multiply a number by 20, we multiply the given number by 2 and put a zero to the right of the product.

1 × 20 = 20

2 × 20 = 40

3 × 20 = 60

4 × 20 = 80

5 × 20 = 100

6 × 20 = 120

7 × 20 = 140

8 × 20 = 160

9 × 20 = 180

**Multiplication by 30**

To multiply a number by 30, we multiply the given number by 3 and put a zero to the right of the product.

1 × 30 = 30

2 × 30 = 60

3 × 30 = 90

4 × 30 = 120

5 × 30 = 150

6 × 30 = 180

7 × 30 = 210

8 × 30 = 240

9 × 30 = 270

**Multiplication by 40**

To multiply a number by 40, we multiply the given number by 4 and put a zero to the right of the product.

1 × 40 = 40

2 × 40 = 80

3 × 40 = 120

4 × 40 = 160

5 × 40 = 200

6 × 40 = 240

7 × 40 = 280

8 × 40 = 320

9 × 40 = 360

**Multiplication by 50**

To multiply a number by 50, we multiply the given number by 5 and put a zero to the right of the product.

1 × 50 = 50

2 × 50 = 100

3 × 50 = 150

4 × 50 = 200

5 × 50 = 250

6 × 50 = 300

7 × 50 = 350

8 × 50 = 400

9 × 50 = 450

**Multiplication by 60**

To multiply a number by 60, we multiply the given number by 6 and put a zero to the right of the product.

1 × 60 = 60

2 × 60 = 120

3 × 60 = 180

4 × 60 = 240

5 × 60 = 300

6 × 60 = 360

7 × 60 = 420

8 × 60 = 480

9 × 60 = 540

**Multiplication by 70**

To multiply a number by 70, we multiply the given number by 7 and put a zero to the right of the product.

1 × 70 = 70

2 × 70 = 140

3 × 70 = 210

4 × 70 = 280

5 × 70 = 350

6 × 70 = 420

7 × 70 = 490

8 × 70 = 560

9 × 70 = 630

**Multiplication by 80**

To multiply a number by 80, we multiply the given number by 8 and put a zero to the right of the product.

1 × 80 = 80

2 × 80 = 160

3 × 80 = 240

4 × 80 = 320

5 × 80 = 400

6 × 80 = 480

7 × 80 = 560

8 × 80 = 640

9 × 80 = 720

**Multiplication by 90**

To multiply a number by 90, we multiply the given number by 9 and put a zero to the right of the product.

1 × 90 = 90

2 × 90 = 180

3 × 90 = 270

4 × 90 = 360

5 × 90 = 450

6 × 90 = 540

7 × 90 = 630

8 × 90 = 720

9 × 90 = 810

Questions and answers about multiplying by 10, 20, 30, 40, 50, 60, 70, 80, 90:

**I. Find the product:**

(i) 32 × 20 = ……….

(ii) 26 × 10 = ……….

(iii) 24 × 30 = ……….

(iv) 25 × 20 = ……….

(v) 9 × 70 = ……….

(vi) 4 × 80 = ……….

(vii) 22 × 10 = ……….

(viii) 18 × 40 = ……….

(ix) 8 × 90 = ……….

**Reply:**

**I.** (i) 640

(ii) 20

(iii) 720

(iv) 500

(v) 630

(vi) 320

(vii) 220

(viii) 720

(ix) 720

**II. Fill in the gaps:**

(i) 7 × …… .. = 140

(ii) 30 × 5 = …… ..

(iii) 50 × …… .. = 500

(iv) …… .. × 25 = 250

(v) 22 × 30 = …… ..

(vi) 20 × 80 = …… ..

(vii) 10 × …… .. = 820

(viii) 5 × 80 = …… ..

(ix) …… .. × 10 = 620

**Reply:**

**II.** (i) 20

(ii) 150

(iii) 10

(iv) 10

(v) 660

(vi) 1600

(vii) 82

(viii) 400

(ix) 62

**3rd grade math class**

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