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Without calculating, comment on the statement 2 ∙ 24 ‚ 3 ∙ 23

An electrician needs 766 feet of 12-gauge wire to do a wiring job. He has 140 feet of 12-gauge 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

  • math -

    "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.

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