math
posted by anonymous .
Without calculating, comment on the statement 2 ∙ 24 ‚ 3 ∙ 23
An electrician needs 766 feet of 12gauge wire to do a wiring job. He has 140 feet of 12gauge wire in stock. How much more wire does he need?
Decide whether or not the first number is divisible by the second.
431,370; 10
Yes but i need to explain how I know

"Decide whether or not the first number is divisible by the second.
431,370; 10
Yes but i need to explain how I know "
All numbers divisible by 10 end with a zero. Since 431,370 ends with a zero, so the number is divisible by 10.
Please post an attempt for the other two.