124
the product, 10 times 6—by joining an 0 to 6 is 60, &c. &c.
11 times any number is very simple, by considering it always as a multiplicand; then whatever the multiplier may be (under 10) to put it down twice:
| 9 times 11, by putting down 9 twice, is | 99. |
| 7 times 11, 7 twice put down, is | 77. |
When 12 is the multiplier, or multiplicand; the usual manner will be found sufficiently easy, as 6 times 12 is found to be 72; by multiplying the 2 of 12 by 6, it makes 12; putting down 2 and carrying 1, and then multiplying the 1 of 12 by 6, and adding the 1 that was carried, to it; it makes 7; which put down by the 2, is 72—or perhaps the following mode, may be more simple in the same sum,—by observing what number the multiplier is above 5—such excess to be the multiplier of the 2 of 12, and then adding the first multiplier to the 1 of 12, gives the sum.
Thus, in the above sum 6 times 12—the 6 is 1 above 5, once 2 (the 2 of 12) is 2, then adding 6 to the 1 of 12 is 7, joined to the 2 already had, is 72.
8 times 12?—8 is 3 above 5—3 times 2 are 6, the 8 added to the 1 of 12 is 9, joined to 6 is 96.
For 10 times 12 the rule has been already given, by joining an O to 12, is 120—but to do 11 times 12, first multiply the 2 of 12 by the 1 of 11, it makes 2, then add 11 to the 2 of 12, makes 13, prefixed to the first 2 makes 132.
| 12 |
| 11 |
| 132 |
