Question

72 × 24 = 1728

Write an expression with parentheses to show how much 24 spools of thread cost.
a) ( 24 × (72 ÷ 24) )
b) ( 72 × (24 ÷ 24) )
c) ( (72 × 24) ÷ 24 )
d) ( (72 ÷ 24) × 24 )

Answer 1

The correct expression to show the cost of one spool is option (c), which uses parentheses to divide the total cost by the number of spools.

Step-by-step explanation:

The question asks to write an expression with parentheses that shows how much 24 spools of thread cost, given that 72 × 24 equals 1728. The correct expression that would represent the cost of one spool is option (c), which is ( (72 × 24) ÷ 24 ). This is because the original multiplication of 72 × 24 gives the total cost for 24 spools, and by dividing by 24, we find the cost of one spool. Dividing the product first by 24 cancels out the 24 in the denominator leaving the cost of one spool, which is 72.