Spiral Review 2.4

Front

What is the process for multiplying decimals?

Back

To multiply decimals, first multiply the numbers as if they were whole numbers. Then, count the total number of decimal places in both factors. The product should have the same number of decimal places as the total counted.

Front

How do you add decimals?

Back

To add decimals, align the numbers by their decimal points and add as you would whole numbers. If necessary, add zeros to make the numbers the same length.

Front

What is the difference between adding and subtracting decimals?

Back

Adding decimals combines values, while subtracting decimals finds the difference between values. The process for both involves aligning decimal points.

Front

What is the product of 245.7 and 0.15?

Back

The product of 245.7 and 0.15 is 147.42.

Front

How do you determine if two decimal numbers are equal?

Back

Two decimal numbers are equal if they have the same value when compared, regardless of the number of decimal places.

Front

What is the total cost if Theo buys a sandwich for $4.47 and two salads for $5.10 each?

Back

The total cost is $4.47 + (2 x $5.10) = $4.47 + $10.20 = $14.67.

Front

If Theo pays with a $20 bill, how do you calculate his change?

Back

To calculate change, subtract the total cost from the amount paid: Change = Amount Paid - Total Cost.

Front

What is the change Theo receives after buying a sandwich and two salads with a $20 bill?

Back

Theo receives $5.33 in change after spending $14.67.

Front

What is the importance of aligning decimal points when performing operations?

Back

Aligning decimal points ensures accuracy in addition and subtraction, as it maintains the correct place value for each digit.

Front

What is a decimal?

Back

A decimal is a fraction expressed in a special form, where the denominator is a power of ten, represented with a decimal point.