Mental Math

Round 84.6575 to the nearest thousandths

Remember to stop at thousandths with decimals

Perimeter = 66m; Length = 20 m; therefore the Width =

• 86m

• 13m

• 46m

• 1320m

Answer explanation

To find Width given Perimeter and Length:

$\left(Perimeter\ \div\ 2\right)\ -\ L$
$\left(66\ \div\ 2\right)\ -\ 20$
$33\ -\ 20\ =13$

X² = 100

therefore X =

• 10

• 20

• 100

• 1000

Answer explanation

A number square is the number multipled by itself so $x^2$ means $x\ \ \times\ x\$ = 100

10 x 10 will give you 100 so x = 10

54.59 x 1000=

 $265.874\ \div\ 100$  

4 - 0.4 =

13 x 30000 =

 $500\div25=$  

 $7\ -\frac{2}{8}=$  

Select two correct answers 

•  $6\ \frac{6}{8}$  

•  $6\ \frac{5}{8}$  

•  $7\ \frac{2}{8}$  

•  $6\ \frac{3}{4}$  

How many quarters in 11.25? (think money) =

• 10 quarters

• 45 quarters

• 44 quarters

• 1125 quarters