My Math Chapter 5 Test - Decimals

Front

What is the Associative Property of Addition?

Back

The Associative Property of Addition states that the way in which numbers are grouped in an addition problem does not change the sum. For example, (a + b) + c = a + (b + c).

Front

What is the Commutative Property of Addition?

Back

The Commutative Property of Addition states that the order in which two numbers are added does not change the sum. For example, a + b = b + a.

Front

What is the Identity Property of Addition?

Back

The Identity Property of Addition states that when you add zero to any number, the sum is that number. For example, a + 0 = a.

Front

How do you subtract decimals?

Back

To subtract decimals, align the numbers by the decimal point and subtract as you would with whole numbers, borrowing if necessary.

Front

If Lamar had $28 and spent $13.28, how do you find out how much he has left?

Back

Subtract the amount spent from the total amount: $28 - $13.28 = $14.72.

Front

How do you estimate the result of a decimal subtraction?

Back

Round each number to the nearest whole number or to a convenient decimal place, then perform the subtraction.

Front

What is the approximate change Felix will receive if his dinner costs $16.49 and he pays with a $20 bill?

Back

Subtract the cost from the amount paid: $20 - $16.49 = about $4.

Front

How do you find the difference in time between two runners?

Back

Subtract the time of the slower runner from the time of the faster runner.

Front

If Luisa ran a mile in 8.34 minutes and Rafael in 9.27 minutes, how do you calculate how much faster Luisa ran?

Back

Calculate the difference: 9.27 - 8.34 = 0.93 minutes.

Front

Back

Round 69.58 to 70 and 32.24 to 32, then subtract: 70 - 32 = about 38.