# Estimating Differences

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##### Intros

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##### Examples

###### Lessons

**Front-End Estimation of Differences**

Estimate the difference using front-end estimation. Then, find the exact difference to check your answer.**Estimating Differences by Rounding**

Estimate the difference using estimation by rounding. Then, find the exact difference to check your answer.**Estimating Differences Word Problem - 1**

Rachel has 152.6 cm (length) of wrapping paper, but she only needs 18.934 cm to wrap a small gift box. About how much wrapping paper will she have left over?**Estimating Differences Word Problem - 2**

Stevie bought a new activity tracker. His goal is to walk 21,000 steps each week. His activity tracker shows his steps from Monday to Thursday so far:- Monday: 4,152 steps
- Tuesday: 3,607 steps
- Wednesday: 2,892 steps
- Thursday: 4,368 steps

About how many more steps does he have to walk for the rest of the week to reach his goal?- Using front-end estimation, about how many steps has he walked already? Then, how many more steps does he need to walk to reach his goal?
- Using estimation by rounding, about how many steps has he walked already? Then, how many more steps does he need to walk to reach his goal?
- Calculate the exact number of steps Stevie still has to walk to reach his goal.
- Using only subtraction, estimate how many more steps Stevie needs to walk with both front-end and rounding estimation methods.

**Estimating Differences Multiple Choice**

Estimate the difference using multiple estimation methods. Then choose the best answer:21$\frac{1}{11}$ - 13$\frac{7}{8}$ =

A. Less than 7

B. Between 7 and 8

C. Greater than 8**Estimating Differences Word Problem - 2**

Use different estimation methods to estimate the difference. Which method gave a more accurate estimate and why?8$\frac{2}{9}$ - 7$\frac{1}{2}$ =