To multiply together 2-digit numbers in cases where the tens digits are the same and the ones digits added together equal 10: ex. 12 x 18 = 216
-Since the tens digits of the numbers being multiplied are the same, multiply this digit times its next higher number. This yields the hundreds digit(s) of the answer. For the ones digit of the answer, simply multiply the ones digits together.
Check these: 83 x 87 = 7221 54 x 56 = 3024 65 x 65 = 4225 71 x 79 = 5609 32 x 38 = 1216 93 x 97 = 9021 104 x 106 = 11024 112 x 118 = 13216