Rate is the measurement of how long a certain process is taken to be completed or how much can be completed in a certain time. For example,the rate of the number of papers that can be printed from Printer A is 70 papers per minute. It can also be phrased in another way like, the rate of child birth in Singapore is 1.24 babies for each mother. Rate questions are usually quite simple to deal with but they may also be phrased like this:
Q1. It takes Mary 5 hours to fix a jigsaw puzzle. If Mabelle helps her, they would take 3 hours to fix the jigsaw puzzle together. How long does Mabelle take to fix the jigsaw puzzle herself?
Ans + formula:
Mary--->1 hour 1/5 done
3 hours 3/5 done
With Mabelle = Mabelle does 2/5 in 3 hours
2/5 = 6/15
Mabelle = 3 hours 6/15 1 hour 2/15
15/2=7.5
Q2. If 3 girls can fold 3 paper origami in 3 minutes,how many pieces of paper origami can be folded by 30 girls in half an hour?
Ans + formula:
3 girls 1 origami 1 minute
30 girls 10 origami 1 minute
30 girls ? origami 30 minutes
10 origami x 30 minutes = 300 origami
Common Mistakes: Students may be confused and infer that 1 girl 1 origami 1 minute and their answers would go completely off.
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