378 x 0 = 0
Zero Property
4 x 36
4 x (__ + __)
(4 x __) + (4 x __)
__ + __ = ___
4 x 36
4 x (30 + 6)
(4 x 30) + (4 x 6)
120+ 24 = 144
24 x 10
240
Use rounding to find the product:
5 x 49
250
65 x 2
130
2,897 x 1 = 2,897
Identity Property
3 x 21
3 x ( __ + __ )
( __ x 20) + ( 3 x __ )
__ + __ = __
3 x 21
3 x (20 + 1)
(3 x 20) + (3 x 1)
60 + 3 = 63
35 x 100
3,500
Use front-end estimation to solve:
4 x 36
120
127 x 4
508
54 x 78 = 78 x 54
Commutative Property
8 x 34
__ x (30 + __ )
(__ x 30) + ( __ x __)
___ + ____ = ____
8 x 34
8 x (30 + 4 )
(8 x 30) + (8 x 4)
240 + 32 = 272
15 x 2,000
30,000
Use rounding to solve:
8 x 55
480
2,479 x 6
14,874
5 x (6 x 7) = (5 x 6) x 7
Associative Property
5 x 72
5 x ( __ + __ )
(__ x __) + (__ x __)
__ + __ = ___
5 x 72
5 x (70 + 2)
(5 x 70) + (5 x 2)
350 + 10 = 360
7 x 800
5,600
Use front end estimation:
7 x 469
2,800
6,902 x 5
34,510
5 x 23 =
5 x (20+3)
(5 x 20) + (5 x 3)
100 + 15 = 115
Distributive Property
9 x 89
9 x 89
9 x (80 + 9)
(9 x 80) + (9 x 9)
720 + 81 = 801
20 x 150
3,000
Use rounding:
6 x 949
5,400
12,482 x 7
87,374