Decimal Operations & Word Problems

Front

What is a decimal?

Back

A decimal is a way of representing numbers that are not whole numbers, using a point to separate the whole part from the fractional part.

Front

How do you add decimals?

Back

To add decimals, align the numbers by the decimal point and add as you would whole numbers, placing the decimal point in the sum directly below the other decimal points.

Front

What is the process for estimating sums?

Back

To estimate sums, round each number to the nearest whole number or a convenient value, then add those rounded numbers.

Front

What is the process for estimating differences?

Back

To estimate differences, round each number to the nearest whole number or a convenient value, then subtract the rounded numbers.

Front

How do you multiply decimals?

Back

To multiply decimals, multiply the numbers as if they were whole numbers, then count the total number of decimal places in both numbers and place the decimal point in the product accordingly.

Front

What is the weight of 1 gallon of water?

Back

1 gallon of water weighs about 8.35 pounds.

Front

Calculate the weight of 4.5 gallons of water.

Back

4.5 gallons of water weighs 37.575 pounds (4.5 x 8.35).

Front

What is the sum of 43.53 and 27.67?

Back

The sum of 43.53 and 27.67 is 71.2.

Front

What is the best estimate for the sum of 43.53 and 27.67?

Back

The best estimate for the sum is 70.

Front

Estimate the difference: 20.11 - 13.27.

Back

The estimated difference is 10.