Rain Gauge Fractions: Adding and Subtracting Rainfall
0 / 12Rain Gauge Fractions: Adding and Subtracting Rainfall
Find a common denominator to add and subtract rain amounts.
Daily rain: fractions
Rewrite the fractions with a common denominator. Then add or subtract.
1.
On Monday the rain gauge showed 1/2 inch. On Tuesday it showed 1/3 inch. How much rain fell on both days?
1/2 + 1/3 = /6 + /6 = /6 inch
2.
Which pair rewrites 3/4 and 5/6 with a common denominator of 12?
3.
On Wednesday, 2/5 inch of rain fell. On Thursday, 1/4 inch fell. How much rain fell on the two days?
2/5 + 1/4 = inch
4.
The gauge held 7/8 inch of water. On a hot, sunny day, 1/2 inch dried up. How much water is left in the gauge?
7/8 − 1/2 = inch
5.
On Friday, 5/6 inch of rain fell. On Saturday, 1/4 inch fell. How much more rain fell on Friday than on Saturday?
5/6 − 1/4 = inch
Weekly and seasonal rain: mixed numbers
Add or subtract the mixed numbers. Regroup when you need to.
6.
In the first week of April, 2 1/3 inches of rain fell. In the second week, 1 1/2 inches fell. How much rain fell in the two weeks?
2 1/3 + 1 1/2 = inches
7.
The town got 4 1/4 inches of rain in spring and 2 2/3 inches in summer. How much more rain fell in spring?
4 1/4 − 2 2/3 = inches
8.
To find 3 1/5 − 1 1/2, Priya rewrites it as 3 2/10 − 1 5/10. What should she do next?
9.
Finish Priya's problem.
3 1/5 − 1 1/2 =
10.
Match each problem to its answer.
Rainy week review
Sort the totals. Then explain a mistake.
11.
Each card shows the rain from two days. Find each total and sort it.
12.
Ben says 1/2 + 1/4 = 2/6 because 1 + 1 = 2 and 2 + 4 = 6. Explain his mistake and find the correct total.