Multiplication

Mental Multiplication:
Example:  83 x 30

Step 1: 83 x 3 = 249, so 83 x 3 = 2490

Now try these:

1.  49 x 50

2. 152 x 30

3. 462 x 40

4. 562 x 30

5. 98 x 20

Example: 34 x 12

Step 1: keep 34 as it is and partition 12 into 10 and 2.

Step 2: 34 x 10 = 340

            34 x 2    =  68

Step 3:  Add 340 and 68. Answer is 408

Now try these:

1. 78 x 13

2. 35 x 14

3. 48 x 16

4. 94 x 14

5. 84 x 22

6. 49 x 23

7. 76 x 31

8. 71 x 19

9. 72 x 22

10. 63 x 12

Example:

156 x 3

Step 1. Partition 156 into 100, 50 and 6

Step 2. Multiply: 100 x 3 = 300

                              50 x 3 = 150

                                6 x 3 =    18

Step 3: Add them: 300 + 150 + 18 = 468

Now try these:

1. 461 x 7           6. 234 x 5

2. 528 x 4           7. 456 x 3

3. 432 x 6           8. 782 x 2

4. 327 x 8

5. 148 x 9