Decimal Operations How To

What is the correct first step when adding 4.23 and 2.7?

• Subtract the smaller number from the larger number.

• Align the decimal points and add the numbers directly.

• Convert the decimals to fractions before adding

• Round each decimal to the nearest whole number before adding

Tags

CCSS.5.NBT.B.7

What is the correct procedure for multiplying 0.40 by 0.75?

• Add the numbers first, then multiply the sum by the decimal places

• Subtract one number from the other, then multiply the result by the decimal places.

• Multiply the numbers as if they were whole numbers, then place the decimal point based on the total number of decimal places in the factors.

• Convert the decimals to fractions, multiply the fractions, and then convert back to a decimal.

Tags

CCSS.6.NS.B.3

When adding 3.456 and 7.8, what should you do first?

• Round both decimals to the nearest whole number before adding.

• Align the decimal points and add zeros to the end of the shorter decimal to match the number of decimal places.

• Convert the decimals to fractions and add the fractions.

• Subtract the smaller decimal from the larger decimal before adding.

Tags

CCSS.5.NBT.B.7

How should you prepare to subtract 15.2 from 23.456?

• Convert both decimals to whole numbers before subtracting

• Align the decimal points, small number on top, and add zeros to the end of the shorter decimal.

• Round both decimals to one decimal place before subtracting

• Align the decimal points, bigger number on top, and add zeros to the end of the shorter decimal.

Tags

CCSS.5.NBT.B.7

What is the correct process for multiplying 2.5 × 4.6?

• Align decimals and multiply like normal, drop down decimal at the end

• Add the numbers before multiplying

• Multiply the numbers as if they were whole numbers, then count the total number of decimal places in both factors to place the decimal point in the product

• Bigger decimal goes on top, multiply like normal

Tags

CCSS.6.NS.B.3

What should you do when dividing 9.36 by 0.6?

• Bigger number goes inside and divide like normal. Ignore the decimals completely.

• Move the decimal point in the divisor to make it a whole number and move the decimal point in the dividend by the same number of places

• Align decimals and divide like you are subtracting

• Multiply the numbers as if they were whole numbers, then count the total number of decimal places in both factors to place the decimal point in the product

Tags

CCSS.7.NS.A.2B

25.75 − 7.68 =

• 18.07

• 18.05

• 18.12

• 18.15

Tags

CCSS.6.NS.B.3

15.6 ÷ 0.4=

• 42

• 40

• 41

• 39

Tags

CCSS.5.NBT.B.7

0.6 × 4.5=

• 3.0

• 2.7

• 2.4

• 3.5

Tags

CCSS.6.NS.B.3

Alex has the following subtraction problem.

15.75 - 7 =

He set up his problem as shown above. What mistake did he make?

Tags

CCSS.6.NS.B.3