Question

Dean received the following amounts for mowing his neighbors'

lawns: $12.50, $16.75, $20.50, $33.25. Use mental math to find
the total amount he earned.

Answer 1

Answer : Dean earned $83.00 dollars

Step - by - step explanation :

When you do mental math it's easier to start small . . .

12.00 + 16.00 = 28.00

28.00 + 20.00 = 48.00

48.00 + 33.00 = 81.00

Now, to add the cents . . .

00.25 + 00.50 = 00.75

00.75 + 00.50 = 01.25

01.25 + 00.75 = 02.00

Finally, add them all together ! :D . . .

81.00 + 02.00 = 83.00

Answer 2

83 dollars.

Explanation:

Mental math means no use of calculators. and if you break this question apart into pieces, they're much easier to comprehend.

The decimals might throw you off, but if you add them all together they equal 2 dollars. Group the two .50 cents together and the .75 and .25 all add up to two. Now, you can just add the 12,16,20,33 in your head and add 2 dollars to get 83.