Multiplication
Estimate & Add
Estimate & Subtract
Rounding
Arrays & More
100
10X6
60
100
38+56=
40+60=100
94
100
52-38=
50-40=10
14
100
Round 36 to nearest 10
40
100
Create an array:
2X8
XXXXXXXX
XXXXXXXX
200
5 X 8
40
200
167+42=
170+40=210 OR 200+40=240
209
200
247-78=
250-80=170 OR 200-100=100
169
200
Round 242 to nearest 10
240
200
Create an array:
3X6
XXXXXX
XXXXXX
XXXXXX
300
9X4
36
300
342+587
300+600=900
929
300
326-159
300-200=100 OR 330-160=170
167
300
Round 561 to nearest 10 and 100
560
600
300
Create an array:
7X4
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
XXXX
400
7X3
21
400
Why is it important to estimate before adding?
Varied answers
It gives you an idea of what the exact answer will be.
400
Why is it important to estimate before subtracting?
Varied Answers
It gives you an idea of what the exact answer will be.
400
Round 2,382 to nearest 10 and 100
2,380
2,400
400
Give an example of the commutative property and show the arrays for each equation.
Varied Answers
500
6X8
48
500
1,357+3,874
1,000+4,000=5,000
5,231
500
4,263-1,738
4,000-2,000=2,000
4,300-1,700=2,600
4,260-1,740=2,520
2,525
500
Round 5,952 to the nearest 10,100, and 1,000
5,950
6,000
6,000
500
