Cement and Sand Ratios

The video tutorial explains how to mix concrete by understanding the ratios of cement to sand and cement to concrete. It uses a table to illustrate these ratios and demonstrates how to calculate the required amounts of sand and cement using proportions. The tutorial also covers how to simplify ratios and determine the percentage of sand in the concrete mixture.

What is the relationship between the number of pails of cement and sand according to the table?

• 5 to 10

• 2 to 5

• 3 to 7

• 1 to 2

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

How can the ratio of cement to sand be expressed?

• Using a plus sign

• Using a semicolon

• Using a fraction bar

• Using a dash

Tags

CCSS.6.RP.A.3A

If the ratio of cement to sand is 3 to 7, what is the simplified form of the ratio 12 to 28?

• 3 to 7

• 5 to 11

• 6 to 14

• 4 to 9

Tags

CCSS.3.OA.A.3

If Bill uses 18 pails of cement, how many pails of sand does he need?

• 30

• 42

• 36

• 28

Tags

CCSS.2.OA.C.3

How many pails of cement are needed if 56 pails of sand are used?

• 18

• 20

• 24

• 28

How do you form a proportion to find an unknown quantity?

• By subtracting two ratios

• By setting two ratios equal

• By dividing two ratios

• By adding two ratios

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

What is the ratio of cement to concrete when using 3 pails of cement?

• 3 to 5

• 3 to 8

• 3 to 7

• 3 to 10

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

What is the ratio of sand to concrete?

• 6 to 10

• 5 to 10

• 7 to 10

• 8 to 10

Tags

CCSS.3.MD.A.2

What is the total number of pails of concrete if 6 pails of cement and 14 pails of sand are used?

• 20

• 22

• 24

• 18

What percentage of the concrete is sand?

• 90%

• 80%

• 70%

• 60%