Binomial products can be used to do mental calculations. For example, to multiply a pair of two-digit numbers whose tens digits are the same and whose units digits add up to 10, mentally multiply the units digits and then multiply the tens digit of the first number by one more than the tens digit of the second. For example,

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[*8*9=72] 84 x 86 72 24 Laxd. c. 63 X 67 e. 75 = 4x6 =24- Mentally multiply the given numbers. a. 62 x 68 b. 57 x 53 d. 95