Answer:
80 (Estimate, we'll get to the exact result at the end.)
Step-by-step explanation:
[tex]\mathrm{(Round)~If~x < 5,~x=y.0}[/tex]
→ y is the number, for instance, 60.0 since 63.0 in the ones/tenths place is less than 5 or 0.5
[tex]20 \times 70 = 1,400[/tex]
→ imagine the newly rounded 73 as 2 × 7 which is 140, but it's 2 more 0's, so it's 1,400.
[tex]\bold{77}\\18|1,400\\18 \times 7 = 126\\140 - 126 = 14\\18 \times 7 = 126\\140 - 126 = 14[/tex]
→ long division was performed. for each time a 0 appeared in 14 when 140 was subtracted by 126(18 • 7), a zero was either borrowed from 1,400 or dropped from 1,400 which became our remainder of 14 both ways around.
→ 77 is close to 75 but not below 5, so it round to 80. therefore, your estimate result is 80.
(The exact result is 81.1)
I hope this helped, let me know if you have concerns.
