Divisibility Test for #3
First of all remember that:
When we say something like "a number is divisible by" means "when you divide one whole number by another whole number the result is a also a whole number"
- 30 is divisible by 5, because 30 ÷ 5 = 6 (and 6 is a whole number).
- 30 is NOT divisible by 8, because 30 ÷ 8 = 3.75 (and 3.75 is NOT a whole number).
30 is divisible by 3, because 3 + 0 = 3 and 3 is divisible by 3.
♦ check! ♦
30 ÷ 3 = 10 (and 10 is a whole number).√
345,123 is divisible by 3, because 3 + 4 + 5 + 1 + 2 + 3 = 18.
If you are not sure if 18 is divisible by 3, repeat the process of adding its digits. See: 18: 1 + 8 = 9 and 9 is divisible by 3.
♦ check! ♦
345,123 ÷ 3 = 115,041 (and 115,041 is a whole number).√
347 is NOT divisible by 3, because 3 + 4 + 7 = 14. and 14 is NOT divisible by 3.
See: 1 + 4 = 5 and 5 is NOT divisible by 3.
♦ check! ♦
347÷ 3 = 115.6666... (and 115.6666... is NOT a whole number). ×
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