13 x 31
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13*31=403 13 and 31 are prime numbers.
Some numbers that you can get when you reverse the digits and they are still prime numbers are: 403 ÷ 13 = 31 2,701 ÷ 37 = 73 1,207 ÷ 17 = 71
403÷8 gives 50 as quotient and 3 as remainder. Dividend- remainder=divisor ×quotient 403-3=8*50 which is 400. our value is 403 So increase divisor 8*51=408. 403+5 gives 408. So 5 must be added to 403 to get a no divisible by 8.
To estimate the product of 87 times 403, you can round both numbers to the nearest tens or hundreds. Rounding 87 to 90 and 403 to 400, you get 90 x 400 = 36,000. This is a rough estimate of the product of 87 times 403.
403 to the nearest tens = 400