Question

Math Homework Unit 3 Section D

A carpenter has 590) nails in his tool bag. He finds a box with some nails in his truck.
Then, he uses 211 nails at a job site. Now, he has 520 nails. How many nails does the
carpenter find in his truck?
The carpenter finds
My answer is 141

591-211=379

520-379=141

Use drawings, numbers or words. Explain how you can use estimation to make sure your answer makes sense.

I need help on how to use estimation. Thanks!!

Answer 1

The carpenter finds 141 nails in his truck. Estimation can be used to ensure the answer makes sense.

Step-by-step explanation:

To find out how many nails the carpenter finds in his truck, we can set up an equation using the given information. We start with the total number of nails the carpenter initially had in his tool bag, which is 590 nails. Then, he uses 211 nails at a job site, so we subtract 211 from the initial total to get 590 - 211 = 379 nails remaining. Finally, we subtract the number of nails remaining from the total after finding the box in his truck, which is 520 nails. So, 520 - 379 = 141 nails. Thus, the carpenter finds 141 nails in his truck.

To use estimation and ensure our answer makes sense, we can round the given numbers to the nearest ten. 590 can be rounded to 600, and since 211 is closer to 210, we can round it down to 210. Now, we can perform the subtraction and estimate the answer. 600 - 210 is approximately 400. However, this estimate is higher than the actual answer of 141 nails, indicating that our answer is reasonable and accurate.

Answer 2

Please see answer below

Step-by-step explanation:

An estimate is an answer to a problem that is close to the solution, but not necessarily exact. Estimation usually requires rounding

Usually you perform the estimate prior to computing actual values.

Let's look at the numbers

591 can be rounded to 600, 211 can be rounded to 200

Then, in your equations instead of using actual numbers we use the estimates

600 - 200 = 400

500 - 400 = 100

Note this is off quite a bit because we are rounding to the nearest 100

Instead if we round to the nearest tens we get

591 ==> 590
211 ==> 210

520==> 520

So we get

590 - 210 = 380

520 - 380 = 140

A little more work but a more accurate estimate