Basic and Extended Facts
5 X 2
5 X 20
5 X 200
10
100
1,000
50
5 X 10
50
5 X 10
87 X 6
522
Use extended facts to round, then estimate the answer.
77
X 8
80
X8
640
8 X 6
8 X 60
8 X 600
48
480
4,800
300
30 X 10
40
4 X 10
Solve using the expanded form:
85 X 5
680
Use extended facts to round, then estimate the answer.
67
X 8
70
X8
560
7 X 9
7 X 90
7 X 900
63
630
6,300
80
8 X 10
6, 000
6 X 1,000
Solve using traditional multiplication:
84
X 5
420
Use extended facts to round, then estimate the answer.
98
X7
100
X7
700
9 X 8
9 X 80
9 X 800
72
720
7,200
4,000
400 X 10
700
7 X 100
Solve using traditional multiplication:
163
X 8
1,308
Use extended facts to round, then estimate the answer.
305
X 5
300
X5
1,500
6 X 9
6 X 90
6 X 900
54
540
5,400
250
25 X 10
30,000
3 X 10,000
Solve using traditional multiplication:
54
X 21
1,134
Use extended facts to round, then estimate the answer.
188
X 4
200
X4
800