Estimation Practice Problems Online

Which of the following is closest to

$123,456,789 \times 987,654,321 ?$

(A) $\ \ 1.0 \times 10^{15}$
(B) $\ \ 1.0 \times 10^{16}$
(C) $\ \ 1.0 \times 10^{17}$
(D) $\ \ 1.0 \times 10^{18}$
(E) $\ \ 1.0 \times 10^{19}$

If Kevin has $25$ quarters, $3$ dimes, $5$ nickels, and $2$ pennies in his pocket, approximately how much money does he have?

(A) $\ \ \$2.5$
(B) $\ \ \$6.25$
(C) $\ \ \$6.8$
(D) $\ \ \$25.35$
(E) $\ \ \$680$

NOTE: One quarter is $\$0.25,$ one dime is $\$0.1,$ one nickel is $\$0.05,$ and one penny is $\$0.01.$

If Jane gets $99$ % on her math test, Tom gets $89$ % and James gets $71$ %, what is their approximate average score?

(A) $\ \ 77$ %
(B) $\ \ 80$ %
(C) $\ \ 86$ %
(D) $\ \ 89$ %
(E) $\ \ 94$ %

The above pie chart shows the number of men, women and children who attended a State Fair. What is the ratio of women to children?

(A) $\ \ 9:4$
(B) $\ \ 4:9$
(C) $\ \ 3:2$
(D) $\ \ 2:3$
(E) $\ \ 1:1$

What is the best approximation of $\sqrt{96}+\sqrt{124}?$

(A) $\ \ 19$
(B) $\ \ 20$
(C) $\ \ 21$
(D) $\ \ 22$
(E) $\ \ 23$

Excel in math and science