Melvin estimate 645 + 322 by adding 600 + 300. Is his estimate sum an over or under estimate please?

Ty

Since both of the estimates are under the actual amounts, what do you think?

To determine if Melvin's estimate is an overestimate or an underestimate, we need to compare it to the actual sum of 645 + 322.

Melvin estimated the sum by rounding both numbers to the nearest hundred. He rounded 645 to 600 and 322 to 300. Then he added 600 + 300, which equals 900.

So, Melvin's estimate is 900.

To find the actual sum, we need to add 645 to 322:

645 + 322 = 967

The actual sum is 967.

Now, let's compare Melvin's estimate (900) to the actual sum (967):

Since 900 is smaller than 967, Melvin's estimate is an underestimate.

Therefore, the answer is that Melvin's estimate is an underestimate.