Question

elijah has a goal to do 80 jumping jacks. use the double number line to find 150% of elijah’s goal.
(the double number line has two vertical lines. the left line is labeled with 0%, 50%, 100%, 150% from top to bottom. the right line is labeled with 0, 40, 80, and a blank box from top to bottom, corresponding to the percentages on the left line for jumping jacks.)

Explanation:

Step1: Analyze the double number line

The left number line is for percentage (0%, 50%, 100%, 150%) and the right is for jumping jacks (0, 40, 80,?). We know 100% of the goal is 80 jumping jacks.

Step2: Find 50% of the goal

50% of 80 is $0.5\times80 = 40$, which matches the 50% - 40 mark on the number line.

Step3: Calculate 150% of the goal

150% is 100% + 50%. So we add 80 (100% of goal) and 40 (50% of goal): $80 + 40 = 120$. Or use the formula: $1.5\times80 = 120$.

Answer:

120