Rounding
Round the number to the nearest thousand
5,645
6,000
6,540
500
What strategy did they use to solve this problem?
43 + 56
43 + 50 = 93
93 +6 =99
Decompose by Place Value
Use Decompose by Place Value to solve this problem
62-24 =
62-24 =?
62-20 =42
42-4=38
62-24=38
Solve the problem using the correct strategy
33 + 46 = ?
Compensation
(33-3) + (46 +3) = 30+49 = 79
Round each number to its greatest place value and estimate the sum
687 + 321 =
700 + 300 =1,000
If 3,546 - 1,983 is about 1,500
What is the place value they rounded the number to?
Nearest ten? Nearest hundred? Nearest thousand?
Nearest hundred
Use Compensation to solve this problem
47 + 54 =
Use Add Up strategy to solve the problem
(You must show your work using a number line)
43-39 =
43-39 =?
39 + ? = 43
39 + 4 =43
43-39 = 4
Choose the strategy that would be most efficient in solving
Then solve the problem using the strategy
63 - 56 =
Add up
56 + ? = 63
56 + 7 =63
63-56 = 7
Round each number to the greatest place value and estimate the difference
1,519 - 954 =
2,000 -1,000 = 1,000
If 3,228 + 4,263 is about 7,000
What is the place value each number is rounded to?
Nearest ten? Nearest hundred? Nearest thousand?
Nearest thousand
Use Decompose to Make A Landmark to solve this problem
588+342 =
588+22= 600
600+320=920
Use Decompose to Make a Landmark to solve the subtraction number sentence
700-213 =?
700 - 213 =?
700-200 =500
500-13=487
Choose the strategy that would be most efficient in solving
67 + 32 =
Decompose by Place Value or Decompose to Make a Landmark
Round each number to its greatest place value and estimate the sum
6,187 + 3, 675 =
6,000 + 4,000 =10,000
Show 4,578 in expanded form
4,000 + 500 + 70 + 8
Use Adjust a Helper Problem to solve this number sentence
39 + 58 =
39+1 = 40
40 + 58 = 98
98 -1 = 97
39 + 58 = 97
Name all 4 Subtraction Strategies (not including stacking)
Add Up
Decompose to Make a Landmark
Decompose by Place Value
Adjust a Helper Problem
What is the most efficient strategy to solve
31 - 23 =
Adjust a Helper Problem
31-1 = 30
30-23 =17
17+1=18
Round each number to the greatest place value and estimate the difference
2,764 - 365 =
3,000 - 400 = 2,600
Show 32,876 in expanded form
30,000 + 2,000 + 800 + 70 +6
Name all 4 addition strategies (not including stacking)
Compensation
Adjust a Helper Problem
Decompose to Make A Landmark
Decompose by Place Value
Use Adjust a Helper Problem to solve the subtraction number sentence
48-19 =
48 - (19+1)=
48-20=28
28+1 =29
Choose the most efficient strategy to solve
3,450 + 2,862 =
Decompose by Place Value
3,000 + 2,000 =5,000
400 +800= 1,200
50+60 =110
2
5,000 + 1,200 +110 +2 =6,312