EXAMPLE 1 Biking The map shows biking times for a trail. Estimating Sums and Differences.
Estimating Sums
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Estimating Sums
description
Estimating Sums. 5 7 + 3 1. Actual answer. 5 7 5 7 + 3 1 + 3 1 8 8. Estimated answer. 5 7 6 0 + 3 1 +3 0 9 0. Your Turn! . Actual answer. 6 8 + 2 4. Estimated answer. 6 8 + 2 4 +_____ 9 2. Estimated answer. 6 8 7 0 - PowerPoint PPT Presentation
Transcript of Estimating Sums
Estimating Sums
5 7+ 3 1
Actual answer
5 7 5 7+ 3 1 + 3 1 8 8
Estimated answer
5 7 6 0+ 3 1 +3 0
9 0
Your Turn!
Actual answer
6 8+ 2 4
Estimated answer
6 8 + 2 4 +_____ 9 2
Estimated answer
6 8 7 0+ 2 4 + 2 0_ 9 2 9 0
Actual answer
367 + 456
Estimated answer
367 + 456 +_____ 823
Estimated answer
367 400+ 456 +_500 823 900
Actual answer
897+ 412
Estimated answer
897 + 412 +_____ 1309
Estimated answer
897 900 + 412 +_ 400 1309 1300
Actual answer
635+ 342
Estimated answer
635 + 342 +_____ 977
Estimated answer
635 600 + 342 +_300 977 900
Actual answer
3,269 + 1,629
Estimated answer
3,269
+1,629 + _______ 4,898
Estimated answer
3,269 3,000
+1,629 +2,000
4,898 5,000
Actual answer
4,092 + 2,808
Estimated answer
4,092
+2,808 +_____ 6,900
Estimated answer
4,092 4,000
+2,808 + 3,000 6,900 7,000
Actual Answers!
5 6+ 3 9
5 6+ 3 9 9 5
2 4 + 6 9
2 4 + 6 9 9 3
4 5 6 +2 4 5
4 5 6 + 2 4 5 7 0 1
1 9 8 + 7 0 9
1 9 8 + 7 0 9 9 0 7
5, 2 9 0
+ 3, 5 7 9
5, 2 9 0
+ 3, 5 7 9 8, 8 6 9
3, 8 1 5
+ 6, 2 9 9
3, 8 1 5
+ 6, 2 9 9 1 0, 1 1 4
7, 4 3 8
+ 4, 2 8 9
7, 4 3 8
+ 4, 2 8 9 1 1, 7 2 7
Estimated Answers!
5 6+ 3 9
6 0+ 4 0
1 0 0
2 4 + 6 9
2 0 + 7 0 9 0
4 5 6 + 2 4 5
5 0 0 + 2 0 0 7 0 0
1 9 8 + 7 0 9
2 0 0 + 7 0 0 9 0 0
5, 2 9 0
+ 3, 5 7 9
5, 0 0 0
+ 4, 0 0 0 9, 0 0 0
3, 8 1 5
+ 6, 2 9 9
4, 0 0 0 + 6, 0 0 0 1 0, 0 0 0
7, 6 3 8
+ 4, 2 8 9
8, 0 0 0 + 4, 0 0 0 1 2, 0 0 0
Well, it’s about time you got the hang of it!
Now, let’s make some A’s!!!
