Sam received 87 dollars for his birthday. He went to a sporting goods store and bought a baseball glove, baseball, and bat. He had 10 dollars left over, how much did he spent on the baseball gear?

Aug 8, 2016

Aug 8, 2016

Aug 8, 2016

He spent $77 Explanation: Although the calculation is very easy, the purpose of this type of question is to be able to interpret 'word sums' and decide on a correct operation. We are actually looking for "THE DIFFERENCE" between the amount of money he started with and the amount he had at the end. 87 - ? = 10 "DIFFERENCE" means subtract. $87 - 10 = 77$He spent$77.

Aug 11, 2016

A slightly different way of dealing with subtraction.

$77 Explanation: Received color(green)($87).

But color(green)($87) can be written as color(green)($77+$10) After spending some money he had color(blue)($10" left").

$\textcolor{red}{\text{So he spent:}}$

color(green)($77+$10)color(blue)( - $10) color(red)(=$77+0" "=" "\$77)