Inverse Operation
64.28-3.67
60.61
20 + 7 + 0 + 10 + 3 Expanded Form
20 + 10 + 7 + 3 + 0
What property is the second line using?
Commutative Property
Round to the nearest dollar
$62.56 + $14.32
$77
Determine if you will estimate or find the exact answer. Then evaluate.
8. On Monday, my coffee stand earned $202.19. On Tuesday, the I earned $186.62. About how much did I earn in all?
Estimate or Exact?
Estimate $389
6,543.968
What number is in the hundredths place?
6
9 - 5.41
3.59
20 + 7 + 0 + 10 + 3 Expanded Form
20 + 10 + 7 + 3 + 0
(20 + 10) + (7 + 3) + 0
What property is the third line using?
Associative Property
Round to the tenth place
67.3 - 42.49
24.8
Determine if you will estimate or find the exact answer. Then evaluate.
Khloe has $28. She spent $13.28 on school supplies. How much money does Khloe have left? Estimate or Exact?
Exact $14.72
6,543.968
What number is in the ones place?
3
73.3 - 19.6
53.7
40 + 0
What property is this?
Identity Property
Round to the hundredths place
987.432 + 654.283
1,641.71
Determine if you will estimate or find the exact answer. Then evaluate.
Mrs. Valentines family rented a house for $89.99 per night. They stayed for 4 nights. About how much did the family spend on the cabin in all?
Estimate or Exact?
Estimate $360
6,543.968
What number is in the hundreds place?
5
782.3 - 343.1
439.2
What happens in the commutative property?
Numbers move around but they are still the same numbers
Round to the nearest dollar
$799.82 + $541.35
$1,341
determine if you will estimate or find the exact answer. Then evaluate.
The dress store purchased 2.33 yards of silk fabric and 3.12 yards of flannel fabric. How many total yards of fabric did they purchase? Estimate or Exact?
Exact 5.45
6,543.968
What number is in the thousandths place?
8
900.21 - 236.54
663.67
Why do we use associative property?
We use associative property to group numbers that are easier for us to add in our heads.
Round to the tenths
689.35 - 500.96
188.4
determine if you will estimate or find the exact answer. Then evaluate.
Last year, Greg's batting average was 0.37. Sam's batting average was 0.29. What was the difference in their averages? Estimate or Exact?
Exact 0.08
6,543.968
What number is in the tenths place?
9