1. use front-end estimation to estimate the sum 8.86 + 9.43 + 5.75
a. 9+10+6+2=27
b. 10+10+10+2=32
c. 8+9+5+1=32
d. 8+9+5+2=24
2. find the estimated difference. round to the nearest whole number 83.92-47.23
a. 37
b. 47
c. 50
d. 30

1. Option D.

2. Option A.

Step-by-step explanation:

1. You need to follow these steps in order to estimate the sum of :

Step 1: Add the digits in the ones places of the whole numbers (these are: 8, 9 and 5).

Step 2: Round the decimals to the nearest whole number:

 Step 3: Add them together:

2. The procedure to estimate  the difference of is:

Rounded to the nearest whole number:

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