65 x 86 - 65 x 6 | 4 |
(52 - 37)x 45 |
=1089 - 189 =900 |
=100 x 9 =900 |
=4 x (4 x 25)
=4 x 100
=400
|
=34 x 100 - 34 x 2
=3400 - 68
=3332
|
=31 x (257 - 57)
=31 x 200
=6200
|