3.1: Estimate Sums and Differences
Round to the nearest whole number than solve
76.81
+ 2.17
77 + 2 = 79
1.3
+ 7.5
8.8
2.8 + 7 + 5.3
15.1
2.73
+2.14
4.87
Your friend buys a remote control car for $17.89 and some batteries for $5.49. He gives the cashier $25. How much change does he receive?
17.89
+ 5.49
= 23.38
25.00
-23.38
= 1.62
Round to the nearest whole number than solve
79.1
-32.8
79 - 33 = 46
84.6
+44.7
129. 3
14.86 + 5.72 - 3
14.86
+5.72
= 20.58
- 3
17.58
54.3
+14.1
= 68.4
Your cousin has $156.34 in his bank account. He withdraws $15.50 one day and $6.75 the next day. How much money is in his bank account now?
15.50+ 6.75 = 22.25
154.34 - 22.25 = 132. 09
Round to the nearest whole number than solve
90.7
+2.3
91 + 2 = 93
71.9
-46.1
25.8
28.95 - 4.12 - 0.7
28.95
- 4.12
= 24.83
- 0.7
= 24.13
19.86
-7.2
= 12.66
Newton buys a movie ticket that costs $4.50, a drink that costs $2.25, and a bag of popcorn that costs $4.75. How much money does Newton spend?
4.50 + 2.25 + 4.75 = 11.50
Round to the nearest whole number than solve
6.24
- 3.8
5.87
-1.88
3.99
5 - 0.2 - 1.37
5.0
-0.2
4.8
-1.37
= 3.43
6.5 + 2.32 + 1.5
= 10.32
Descartes buys a book for $14.99 and a bookmark. He pays with a $20 bill and receives $3.96 in change. How much does the bookmark cost?
14.99
+ 3.96
= 18.95
20 - 18.95 = 1.05
Round to the nearest whole number than solve
837. 51
+149.27
838 + 149 = 987
The world record for the longest dog tongue is 18.58 centimeters. The previous record was 11.43 centimeters. By how many centimeters was the record broken?
18.58
-11.43
= 7.15 cm
10.6 − 10.35 + 34.27
10.60
-10.35
= .25
34.27
= 34.52
2.25 - 1.15
= 1.1
You buy 3 cell phone games that cost $5 each and an in-game purchase for $1.69. How much money do you spend?
15 + 1.69 = 16.69