# Math

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Keith wrote the expression 10d to represent the number of dimes in d dollars. Is Keith's expression correct? Explain.

• Math -

Right.

• Math -

Can you explain? I was thinking that d/10 would be the answer, since there are 10 dimes in a dollar. If the expression was 10d wouldn't that mean 10 dimes X 1 dollar?

• Math -

10 dimes = \$1.00
20 dimes = \$2.00
30 dimes = \$3.00

So --
10 times 3 = 30
10 times 4 = 40

• Math -

5 doller bills and 3 dimes

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