Rounding
47 rounded to the nearest ten
50
Which property says that
6+3=9
3+6=9
Estimate the answer:
47+23=
50+20=70
234+155
389
555-145
410
323 rounded to the nearest hundred
300
Which property says that
157+0=157
Identity Property of addition
Estimate the answer:
64-37=
60-40=30
340+239
579
487-187
300
453 rounded to the nearest hundred
500
Which property allows the following to be true?
(5+3)+6= 5+(3+6)
Estimate the answer:
523+274=
500+300= 800
520+270=790
465+235
700
519-290
229
607 rounded to the nearest ten
610
The _______ property of addition states that any number plus 0 results in the number itself.
Identity
Estimate the answer:
678-431=
700-400=300
680-430=250
378+456
834
674-362
312
809 rounded to the nearest hundred
800
Ms. Emily wants to check her answer to the problem
56+23=79
What problem would she write to check her answer?
79-23=56
OR
79-56=23
Estimate the answer:
523-261=
500-300=200
520-260=260
571+432
1003
424-189
235