Vocabulary
numbers that are added together
What are addends?
Name the property...
(2.4 +1.6) + 3.7 = 7.7
What is the Associative Property?
20.47 + 10.52 =
What is 20.5 + 10.5 = 31?
0.82 + 4.21 =
What is 5.03?
16.82 - 5.2 =
What is 11.62?
numbers that are easy to calculate mentally.
what are compatible numbers?
Name the property...
3.4 + 1.7 = 1.7 + 3.4
What is the Commutative Property?
3.67 + 2.30 =
What is 3.7 + 2.3 = 6?
6.9 + 2.8 =
What is 9.7?
7.8 - 4.9 =
What is 2.9?
Changing the order of the addends doesn't change the sum.
What is the commutative property?
Complete the equation to show Commutative Property...
3.8 + 2.6 =
What is 2.6 + 3.8?
24.82 - 4.02 =
What is 24.8- 4.0 = 20.8?
2.00 + 0.78 =
What is 2.78?
7.09 - 3.65 =
What is 3.44?
When adding three or more numbers, the grouping of the addends doesn't change the sum.
What is the associative property?
Pick the equation that uses compatible numbers...
(4.8 + 12.3) + 5.2
or
(4.8 + 5.2) + 12.3
What is (4.8 + 5.2) + 12.3?
5.53 + 3.48 =
What is 5.5 + 3.5 = 9?
1.03 + 0.36 =
What is 1.39?
$21.37 - $10.95 =
What is $10.42?
An operation that undoes answer operations.
Hint: opposites
What is an inverse operation?
Use the Associative Property to allow for mental math...
2.5 + 13.28 + 7.5
What is (2.5 + 7.5) + 13.28?
10.52 - 5.38 =
10.5 -5.4 = 5.1?
7.2 + 3.96 + 8.8 =
What is 19.96?
8.04 - 0.3 =
What is 7.74?