Number Line
8+18
26
23+18
41
34+19
53
Round 42 to the nearest ten
40
If I add two even numbers will the sum be even or odd?
even
14+20=
34
12+35
47
23+ 105
128
Round 85 to the nearest ten
90
Estimate 36+48
90
23+48
71
45+149
194
78+345
423
200
Estimate 456+234
700 or 690
129+118=
247
413+358
771
289+193
482
Round 478 to the nearest ten
480
Michael ate 12 cookies and Everett ate 45 cookies. Then after Mrs. Handley made more Olive ate 27 cookies. How many cookies in all were eaten?
84 cookies
346+112
And answer, did you re-group?
458
No
226+745
And did you need to regroup? If so, why?
971
Yes, because there was 10 or more ones that regrouped to the tens place.
543+328
And did you regroup? If so, why?
871
Yes because there was 10 or more in the ones place that regrouped to the tens place.
Round 234 to the nearest ten AND hundred
230 and 200
If I add two odd numbers will the sum be even or odd and why?
The sum will be even because the odd numbers will each have a left over (with no pair), that will come together to make a pair to be an even number.