Answers − Long Multiplication − Box Method
1. 23 × 97 =
(a) create a table: with 20 and 3 in the first row; and 90 and 7 in the first column
(b) complete the remaining cells by multiplying as follows:
|
(c) add up all the values that were multiplied in second step above:
| 1800 |
| 270 |
| 140 |
| + 21 |
| ------- |
| 2231 |
2. 475 × 88 =
(a) create a table: with 400, 70 and 5 in the first row; and 80 and 8 in the first column
(b) complete the remaining cells by multiplying as follows:
|
(c) add up all the values that were multiplied in second step above:
| 32000 |
| 5600 |
| 400 |
| 3200 |
| 560 |
| + 40 |
| ------- |
| 41800 |
3. 576 × 72 =
(a) create a table: with 500, 70 and 6 in the first row; and 70 and 2 in the first column
(b) complete the remaining cells by multiplying as follows:
|
(c) add up all the values that were multiplied in second step above:
| 35000 |
| 4900 |
| 420 |
| 1000 |
| 140 |
| + 12 |
| ------- |
| 41472 |
4. 1783 × 37 =
(a) create a table: with 1000, 700, 80 and 3 in the first row; and 30 and 7 in the first column
(b) complete the remaining cells by multiplying as follows:
|
(c) add up all the values that were multiplied in second step above:
| 30000 |
| 21000 |
| 2400 |
| 90 |
| 7000 |
| 4900 |
| 560 |
| + 21 |
| ------- |
| 65971 |
5. 684 × 47 =
(a) create a table: with 600, 80 and 4 in the first row; and 40 and 7 in the first column
(b) complete the remaining cells by multiplying as follows:
|
(c) add up all the values that were multiplied in second step above:
| 24000 |
| 3200 |
| 160 |
| 4200 |
| 560 |
| + 28 |
| ------- |
| 32148 |
6. 786 × 77 =
(a) create a table: with 700, 80 and 6 in the first row; and 70 and 7 in the first column
(b) complete the remaining cells by multiplying as follows:
|
(c) add up all the values that were multiplied in second step above:
| 49000 |
| 5600 |
| 420 |
| 4900 |
| 560 |
| + 42 |
| ------- |
| 60522 |
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