Video: Estimating the Answer to One-Step Word Problems

Class A and Class B were collecting money for charity. Class A raised $217. Class B raised $389. Pick the best estimate for the total amount they raised. [A] $200 [B] $400 [C] $500 [D] $600 [E] $700, How much did they actually raise?

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Video Transcript

Class A and class B were collecting money for charity. Class A raised 217 dollars. Class B raised 389 dollars. Pick the best estimate for the total amount they raised. And then, calculate how much money they actually raised.

The first part of the problem is asking us to pick the best estimate. We need to estimate 217 plus 389. All of the answer choices are given to the nearest hundred. Which means, we should round each of these values to the nearest hundred.

217 has a one in the tens place. That one is less than five. And that means we’ll round 217 down to 200. 389 has an eight in the tens place. Eight is larger than five. And that means we’ll take 389 and round it up to 400. Class A raised about 200 dollars. Class B raised about 400 dollars. 200 plus 400 equals 600. A good estimate for the total would be 600 dollars.

Now, we move on to the second part of the problem and add the two values they actually raised together, 217 plus 389. Starting to the right in the units place, seven plus nine equals 16. That’s six units and one 10. Moving on to the tens place, we then say one plus one plus eight equals 10. Bring down your zero. Carry your one. Finally, we add up the hundreds place. One plus two plus three equals six. Together, the two classes raised 606 dollars.

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