33, 63 and 93
To find how many two-digit numbers have digits whose sum is a perfect square, we first note that the two-digit numbers range from 10 to 99. The possible sums of the digits (tens digit (a) and units digit (b)) can range from 1 (1+0) to 18 (9+9). The perfect squares within this range are 1, 4, 9, and 16. Analyzing each case, we find the valid combinations for each perfect square, leading to a total of 36 two-digit numbers whose digits sum to a perfect square.
There are no such numbers. The smallest set of three consecutive composite numbers is {8, 9, 10} and the product of these numbers is 720.
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It is composite, as are all whole numbers whose last digits are even.
Any integer whose units' digit is 0.
84
754 Piece of cake!
Ten.
10,20
12 & 16
There are no such numbers. The smallest set of three consecutive composite numbers is {8, 9, 10} and the product of these numbers is 720.
99. 9 divided by 9=1
What is the units digit of the least whole number greater than 1000 whose digits are all different?
6,364 and 9
4 and 8
There are 5460 five digit numbers with a digit sum of 22.
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