Multiple choice general knowledge math & puzzles

How many two-digit numbers satisfy this property.: The last digit (unit's digit) of the square of the two-digit number is 8 ?

  1. 2

  2. 4

  3. 8

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For a number to have its square end in 8, its units digit must produce 8 when squared. Testing digits 0-9: 0²=0, 1²=1, 2²=4, 3²=9, 4²=16, 5²=25, 6²=36, 7²=49, 8²=64, 9²=81. None of these end in 8. Therefore, no two-digit number can have its square end in 8.

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