Round to the Nearest 10
31
30
102
100
What has the same value at 32 + (16 + 7)
16 + (32 + 7)
OR
7 + (16 + 32)
32 + 71
30 + 70
Is 5 even or odd?
Odd
46
50
599
600
What has the same value as (35 + 25) + 12?
(25 + 12) + 35
OR
25 + (35 + 12)
58 + 46
60 + 40
OR
60 + 45
OR
55 + 45
Is the sum even or odd? 8+9=
Odd
85
90
434
400
Which one shows the Associative Property of Addition?
3 + 0 = 3
56 + (13 + 9)
56 + (13 + 9)
290 + 880
OR
300 + 900
What is the next three numbers in the pattern?
3, 6, 9, 12,
15, 18, 21
367
370
550
600
What has the same value as 800 + (567 + 233)
233 + (800 + 567)
OR
567 + (233 + 800)
Add using reasonable numbers.
515 + 54 + 107
520 + 50 + 110= 680
Is your sum reasonable?
What is true about the numbers in this pattern?
2, 4, 6, 8, 10
They are all even numbers
OR
count by 2's.
1478
1480
2567
2600
What is the Associative Property of Addition?
You can group addends in different ways and still get the same sum.
Bob has 287 pencils. He uses 58 yellow pencils and 12 black pencils. About how many pencils does Bob have left?
300 - 70 = 230
If you have two addends that are odd, will your sum be even or odd? Give an example.
Even
Example: 3+7=10