Vocabulary
The _____________ property states that you can add numbers in any order.
Commutative
Round 6.938 to the nearest whole number.
7
3.96 + 2.95
6.91
$45.93 + $0.87
$46.80
What property is shown?
4 + 0 = 4
Identity Property
The result of subtracting two numbers
difference
Round 12.87 to the nearest tenth.
12.9
12.95 - 6.38
6.57
$69.75 - $12.98
$56.77
A movie ticket costs $18.35. About how much do two tickets cost?
$36.00 or $40.00
The _______________ property states that they way in which the numbers are grouped does not change the sum.
Associative
Round 463.972 to the nearest hundredth
463.97
85.9 + 123.84
209.74
Maria earned $53.68 in a fundraiser, then spent $9.69. How much does she have left?
$43.99
Solve the problem using a property. Show your steps.
84 + 27
80 + 4 + 20 + 7
(80+20) + (4+7)
100 + 11 = 111
When you round a number, you find its __________.
estimate
Round each decimal to the nearest tenth, then add.
12.47 + 4.29 =
16.8
538.94 - 2.3
515.94
Mrs. Orlando had $500.00 in her bank account. She withdrew $129.99 to buy sneakers. How much does she have in her account?
$370.01
Write the property and solve.
(47 + 4) + 12
63
To make a new or restructured group when adding or subtracting
regroup
Round each decimal to the nearest tenth, then subtract.
4.92 - 1.48
3.4
4.8 + 12.4 + 95.36
112.56
Ms. Beerman had $654.97 in her bank account. She deposited $39.75 more. What was her new balance?
$694.72
Anthony had $12.50 after he left the store. He bought candy $1.23 and gum for $3.36. How much did he have before he went to the store?
$17.09