Vocabulary
________ states that you can add numbers in any order.
Commutative Property
Complete the Sentence:
_______ 7.45 to the nearest whole number.
Round.
Which is the best estimate for 5.82 + 14.03?
a.) 19
b.) 20
c.) 21
d.) 22
b.) 20
63.8 + 8.12
71.92
Complete the Sentence:
Subtracting results in finding the ________ between two numbers.
Difference
Numbers that are easily added or subtracted mentally.
Compatible Numbers
Nearest Tenths
45.263
45.3
What is the best estimate for 69.58 - 34.26?
a.) 36
b.) 37
c.) 103
d.) 104
a.) 36
73.28 + 32.48
105.76
42.28 - 3.64
38.64
When you round a number you find its _____________.
Approximate Value
Nearest Hundredths:
745.2145
745.21
Adrienne's lunch cost $13.16. She hands the cashier $20. About how much change does Adrienne receive?
$7
69.77 + 5.02
74.79
73.28 - 19.5
54.78
When using actual numbers, you find an ___________.
Nearest Ones:
458.221
458
Which is the best estimate for $2,346.87 + $8,867.14?
a.) $ 6,000
b.) $ 9,000
c.) $10,000
D.) $11,000
D.) $11,000
Which Property is shown here?
(64 + 79) + 48 = 64 + (79 + 48)
Associative Property
9 - 5.79
3.21
If you do not need an exact answer, you can check for a(n) _________.
Reasonable Estimate
Nearest Tenths:
18.65
18.7
Estimate:
45.525 + 12.457
46 + 12 = 58
Which property is shown below?
745.96 + 0 = 745.96
Identity Property
The coach recorded how fast the runners ran 1 mile. Emmett ran a mile in 9.73 minutes, Kate ran a mile in 10.87 minutes, and Robin ran a mile in 8.46 minutes. How many more minutes did Emmett run than Robin?
9.73-8.46 = 1.27 more minutes.