Rounding & Estimating
Round 7,683 to the nearest 10
7,680
245 + 671 = ?
Solve for the unknown number
the sum is 916
The rule is + 13
in out
14
9
29
in out
14 27
9 22
16 29
Anna went to the store and bought a container of 24 oreo cookies and 50 chocolate chip cookies. How many cookies does she have altogether?
74
Show me two ways to solve this addition problem:
145
+231
Draw a model
Standard addition
Expanded form addition
Round the number to it's greatest place value:
23,091
20,000
998 + 123 = ?
Solve for the unknown number
1,121
The rule is + 100
in out
124
907
329
The rule is + 100
in out
124 224
907 1,007
229 329
Ayub has 10 pencils in his desk. He has 113 extra pencils at home. How many total pencils does he have?
What is 46,987 rounded to the nearest TEN THOUSAND
50,000
Round the addends to the nearest ten and then estimate the sum:
451 + 23= ?
450 + 20 = 470
2,347 + 6,089 = ?
Solve for the unknown number
8,436
What is the rule?
in out
12 34
93 115
214 236
Aria walked her dog for 29 minutes on Friday, 35 minutes on Saturday and 41 minutes on Sunday. How many total minutes did she walk her dog?
105 minutes
Is it reasonable to say that 561 +792 is about 1,300?
No, it should be estimated to 1,400
Round the addends to the nearest hundred and then estimate the sum:
345 + 990 =
300 + 1,000 = 1,300
9,278 + 2,602 = ?
Solve for the missing number
11,880
What is the rule?
in out
3,423 3,400
5,901 5,900
245 200
The rule is round to the nearest hundred
Amy saved $261 in the months of May and June. She saved $129 in May. How much did she save in June?
$132
Which digit is in the hundred thousands place?
325,671
The 3
Round the addends to the nearest ten and then estimate the sum:
32 + 194 + 4,601 = ?
30 + 200 +4,600 = 4,830
653 + ? = 754
Solve for the missing addend
101
What is the rule?
in out
10 19
4 7
15 29
7 13
The rule is double the number and subtract 1
Hannah and Xavier rounded and estimated the answer to this problem 781 + 231
Hannah said 1,000
Xavier said 1,010
Their friend Elliot says they are both right, how can this be true?
Hannah rounded the numbers to the nearest hundred, Xavier rounded to the nearest tens place.
Find the missing addend
1,253 + __ = 2,890
1,637