Answer:
1. Option D.
2. Option A.
Step-by-step explanation:
1. You need to follow these steps in order to estimate the sum of [tex]8.86 + 9.43 + 5.75[/tex]:
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:
[tex]0.86\approx 1\\\\0.43\approx0\\\\0.75\approx1[/tex]
Step 3: Add them together:
[tex]8+9+5+1+0+1=8+9+5+2=24[/tex]
2. The procedure to estimate the difference of [tex]83.92-47.23[/tex] is:
[tex]83.92-\\47.23\\........\\40.00\\\ -4.00\\\ \ + 0.70\\-0.01\\...........\\+36.00\\+0\ 0.69\\..............\\36.69[/tex]
Rounded to the nearest whole number:
[tex]36.69\approx 37[/tex]
