Estimating sums

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Intros

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Lessons

Example of estimating the sum of 1617 + 3898
How to round mixed fractions
Key terms for estimating sums
Front-end estimation for sums
Estimation by Rounding for sums
Underestimating and overestimating sums

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Examples

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Lessons

Front-End Estimation of Sums
Estimate the sum using front-end estimation. Then, find the exact sum to check your answer.
1. 6895 + 2413 + 1878 =
2. 0.835 + 0.02 + 0.66 =
3. 36 $\frac{3}{10}$ + 14 $\frac{1}{2}$ + 27 $\frac{2}{5}$ =
Estimating Sums by Rounding
Estimate the sum using estimation by rounding. Then, find the exact sum to check your answer
1. 3128 + 744 + 29 =
2. 3.78 + 0.94 + 5.261 =
3. 6 $\frac{2}{9}$ + 9 $\frac{3}{6}$ + 8 $\frac{4}{7}$ + 3 $\frac{1}{11}$ =
Estimating Sums Word Problem - 1
A pirate finds a map that shows the route to some treasure. The instructions tell the pirate to go: 25.42 km North, then 61.3 km West, and finally 79.018 km North-East.
- About how many kilometers is the entire route to the treasure?
1. Write the addition equation that represents this question.
2. Use the front-end estimation method to estimate.
3. Use the rounding estimation method to estimate.
4. Calculate the exact answer.
Estimating Sums Multiple Choice
Estimate the sum using multiple estimation methods. Then choose the best answer:

12 $\frac{5}{8}$ + 11 $\frac{4}{5}$ =
A. Less than 23
B. Between 23 and 24
C. Greater than 24
Estimating Sums Word Problem - 2
This week, Elizabeth ran 3 $\frac{1}{5}$ $\frac{1}{5}$ miles on the Monday, 7 $\frac{3}{4}$ $\frac{3}{4}$ miles on Wednesday, and 5 $\frac{3}{8}$ $\frac{3}{8}$ miles on Friday. About how many miles did she run in total for the week?
1. Write the addition statement that represents the question.
2. Use front-end estimation method to estimate.
3. Use the rounding estimation method to estimate.
4. Calculate the exact answer.