Addition/ Subtraction With Regrouping
93 + 27=
120
Estimate-
Round to the nearest ten
349-156=
190
296+371=
667
Which property is being shown?
3 + 4 = 4 + 3
Commutative Property of Addition.
Is the sum even or odd?
4 + 9
13
Odd
54 + 76=
130
Estimate-
Round to the nearest ten 579+219=
800
511+396=
907
Which property is being shown?
55 + 0 = 55
Identity Property of Addition
Amber: 382 shells
Melba: 455 shells
Pablo: 421 shells
True or False: Melba collected about 40 more shells than Pablo.
True. Round to the nearest ten and subtract.
92-63=
29
Estimate-
Round to the nearest hundred 765-248=
600
503-363=
140
This property states that you can group addends in different ways and still get the same sum.
Associative Property of Addition.
Amber: 382 shells
Melba: 455 shells
Pablo: 421 shells
True or False: Amber collected about 60 fewer shells than Pablo.
False.
73-56=
17
Estimate-
Round to the nearest hundred 500-245=
300
843-652=
191
This property states that the sum of zero and any number is that number.
Identity Property of Addition.
The chart shows how many people went to the zoo each day.
Monday 246
Tuesday 418
Wednesday 349
Thursday 508
How many more people visited the zoo on Wednesday than on Monday?
103 more people.
Bob and Sarah drove 58 miles on Saturday. On Sunday they drove 23 miles. How many miles did he drive on Saturday and Sunday?
81 miles
Abby and Cruz are playing a game. Abby's score is 586 points. Cruz's score is 754. Abby estimates she needs about 200 points more to reach Cruz's score. How did she estimate?
She rounded their scores to the nearest hundred.
Abby: 586 rounds to 600
Cruz: 754 rounds to 800
600+200= 800
Madison solves this problem. She says the difference is 419. Explain the mistake Madison made. What is the correct difference?
645-236
She forgot to regroup the tens place by changing the 4 tens to 3 tens.
Which property is being shown?
(7 + 3) + 6 = 7 + (3 + 6)
Associative Property of Addition
The chart shows how many people went to the zoo each day.
Monday 246
Tuesday 418
Wednesday 349
Thursday 508
How many more people visited the zoo on Monday and Tuesday than on Wednesday?
315 more on Monday and Tuesday than on Wednesday.