Adding and Subtracting Decimals Test

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 number 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 answer directly below the other decimal points.

Front

How do you subtract decimals?

Back

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

Front

What is the difference between two decimal numbers?

Back

The difference is the result of subtracting one decimal number from another.

Front

If Jesse's hamster weighed 2.03 grams and now weighs 20 grams, how do you find the difference?

Back

Subtract the initial weight from the current weight: 20 - 2.03 = 17.97 grams.

Front

How do you find out how much time Carl took if Howard took 50.3 seconds and was 0.85 seconds behind?

Back

Add 0.85 seconds to Howard's time: 50.3 + 0.85 = 51.15 seconds.

Front

What is the remaining length of rope after cutting?

Back

Subtract the length of rope cut from the original length: 19.55 - 8.56 = 10.99 meters.

Front

How do you calculate the difference in distances jumped by a frog?

Back

Subtract the first jump distance from the second jump distance: 31.5 - 30.6 = 0.9 centimeters.

Front

If Jenny has $100.24 and takes out $80, how do you find the remaining amount?

Back

Subtract the amount taken out from the total amount: 100.24 - 80 = 20.24 dollars.

Front

What is the importance of aligning decimal points when adding or subtracting?

Back

Aligning decimal points ensures that each digit is in the correct place value, which is crucial for accurate calculations.