Part 1
Using rounding or compatible numbers, we estimate the product
[tex]5\times2 \frac{3}{5} [/tex]
to
[tex]5\times3[/tex]
Therefore, the estimate of the product [tex]5\times2 \frac{3}{5} [/tex], using rounding and compatible numbers is about 15.
Part 2
Using rounding or compatible numbers, we estimate the quotient
[tex]25\frac{7}{8}\div2 \frac{8}{9} [/tex]
to
[tex]27\div3[/tex]
Therefore, the estimate of the quotient [tex]25\frac{7}{8}\div2 \frac{8}{9} [/tex], using rounding and compatible numbers is about 9.
Part 3
Given that Mr.
Garcia's class ate [tex]3\frac{2}{3}[/tex] pizzas, Mrs Rizzoli's class ate [tex]4\frac{1}{8}[/tex] pizzas,
and Mrs. Tindal's class ate [tex]3\frac{1}{4}[/tex] pizzas.
Using benchmarks, we estimate the
total number of pizzas eaten by all three classes as follows: [tex]3\frac{3}{4}[/tex], [tex]4[/tex] and [tex]3\frac{1}{4}[/tex]
Thus, the total number of pizzas eaten by all three classes is given by
[tex]3\frac{3}{4}+4+3\frac{1}{4}=11[/tex]
Therefore, the total number of pizzas eaten by all three classes is about 11.
