An algorithm for dividing decimals states you cannot have a decimal point in the divisor. to remove the decimal, multiply both factors by a factor of 10. for example, 26 ÷ 1.3 becomes 260 ÷ 13 = 20. 20 is also the solution for 26 ÷ 1.3.

which number sentence correctly models this algorithm for 75 ÷ 2.5?

a. 2.5 ÷ 750 = 300
b. 75 ÷ 250 = 0.3
c. 750 ÷ 25 = 30
d. 75 ÷ 25 = 3

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.