Best Answer

The sum of the digits in '89' is 17, so I don't need to

worry about any perfect square bigger than 16.

1: 10

4: 13, 22, 31, 40

9: 18, 27, 36, 45, 54, 63, 72, 81

16: 79

That's 14 of them .

Q: How many of the numbers from 10 through 89 have the sum of their digits equal to a perfect square?

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16 of them.

18

17 of them. 17 of them. 17 of them. 17 of them.

the highest sum of the numbers is 17 and the lowest is 1. The only perfect squares in that range are 1,4,9, and 16. That means the following numbers will work: 10,13.18,22,27,31,36,40,45,54,63,72,79,81,88, and 90; that is 16 numbers

Square numbers * * * * * Although "perfect square numbers" is more descriptive.

Related questions

There are 17 such numbers.

16 of them.

18

14

17 of them. 17 of them. 17 of them. 17 of them.

69

If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.

121.

the highest sum of the numbers is 17 and the lowest is 1. The only perfect squares in that range are 1,4,9, and 16. That means the following numbers will work: 10,13.18,22,27,31,36,40,45,54,63,72,79,81,88, and 90; that is 16 numbers

There are 14 such numbers: 10, 13, 18, 22, 27, 31, 36, 40, 45, 54, 63, 72, 79, 81

8362 = 698896

No. Square numbers (or perfect square numbers) are squares of integers. The perfect square numbers are 1, 4, 9, 16, 25, 36 ... 20 is not in the series.