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### Course: 3rd grade>Unit 8

Lesson 2: Estimation word problems

# 2-step estimation word problems

Sal solves a 2-step estimation word problem with whole numbers.

## Want to join the conversation?

• I didn't understood :( Why should we change the amount?
• because, the question asked to estimate. So sal rounded to the nearest tens place
• Total tires needed: 28 cars * 4 tires/car = 112 tires

Subtract the tires he already has: 112 needed tires - 22 existing tires = 90 tires to buy

So, the race car driver needs to buy approximately 90 tires.
• No one hundred 💯
• It’d two different answer how does this make sense
• what does estimate mean?
• To estimate means to make a good guess. It's like when you look at a jar of jellybeans and try to guess how many are inside. You don't count each one, but you make a good guess based on what you see. In math, we often estimate to make numbers easier to work with. For example, if a number is 28, we might estimate it to 30 because it's a "friendlier" number.
• When is it more useful to use estimation in real life?
• Can someone give me an example of PEMDAS ? Because I don't know it.╮(╯_╰)╭
• what do you mean by roughly?
(1 vote)
• If the question says estimate, but you give the exact answer, would that be marked wrong?
(1 vote)
• Yes, you will be marked wrong.
(1 vote)
• I don't know how
(1 vote)
• they said that 30 is a "friendlier" number to 30. so are we going to always have to use "friendly" numbers all the time when we estimate? because that word got me a little bit confused. also the thing when we need to do multiplication before subtraction or addition, does it also applies to everyday calculation? because we use math when it comes to counting in life too
(1 vote)