Keith wrote the expression 10d to represent the number of dimes in d dollars. Is Keith's expression correct? Explain.
Right.
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?
10 dimes = $1.00
20 dimes = $2.00
30 dimes = $3.00
So --
10 times 3 = 30
10 times 4 = 40
5 doller bills and 3 dimes
In Keith's expression, 10d, he is trying to represent the number of dimes in d dollars. To determine if his expression is correct, we need to understand the relationship between dimes and dollars.
In this case, one dollar is equivalent to 10 dimes. Therefore, to represent the number of dimes in d dollars, we need to multiply the number of dollars by 10.
So, the correct expression should be 10 times d, which can be written as 10d. Keith's expression, 10d, is indeed correct as it accurately represents the number of dimes in d dollars by multiplying d dollars by 10.