Vocabulary
A way of doing math in my head.
Mental Math
8 + 0 = ______
Solve. Then identify the property used:
Associative, Commutative, Identity
Identity
1 more than 485
486
58 rounded to the next whole number is _____
60
54 + 43
97
When you add zero to any number, the sum is that number.
0 + 6 = 6
Identity Property
8 + 9 = 8 + _____
Solve. Then identify the property used:
Associative, Commutative, Identity
9
Commutative
10 more than 310
320
98 rounded to the next whole number
100
88 + 57
145
The GROUPING of numbers does not change the sum.
(5+6) + 8 = 5 + (6+8)
Associative Property
3 + (7+9) = (3+___) +9
Solve. Then identify the property used:
Associative, Commutative, Identity
7
Associative
100 more than 2,419
2,519
170 rounded to the nearest hundred.
200
508 + 426
934
The ORDER in which numbers are grouped does not change the sum. Flip Flop property
3 + 2 = 2 + 3
Commutative Property
Fill in the blank.
If you know 3 + 6 = _____
then you know ___+ 3 = ___.
3 + 6 = 9
6 + 3 = 9
1,000 more than 3,285
4,285
Round first, then add
67 + 32 = ?
____ + ____ = ______
70 + 30 = 100
643 + 282
925
A number close to its actual value but not exact is call a(n) ______________.
estimate
Which number sentence is an example of the Associative Property?
A. 5+1 = 1+5
B. 583 + 0 = 583
C. (8+2) +5 = 8 + (2+5)
D. 3+5 = 5+3
C. (8+2) +5 = 8 + (2+5)
5,530 + _____ = 5,630
+100
625 + 229 = ?
Round first, then add.
____ + ____ = _____
630 + 230 = 860
2,208 + 5,092
7,300