五道脫式
32+89-65
=121-65
=56
3×6+9
=18+9
27
98-69+45×9
=98-69+405
=434
12+9-6×3
=12+9-18
=3
58-45+6÷2
=58-45+3
=16
四道方程
3+6x=27
6x=27-3
6x=24
x=4
5x÷4=10
5x=40
x=8
8x+15=55
8x=55-15
8x=40
x=5
9y÷3=69
9y=69×3
y=23
三道簡便
106×86
=(100+6)×86
=100×86+6×86
=8600+516
9116
25×4+75×4
=(25+75)×4
=100×4
=400
99×86
=(100-1)×86
=100×86-1×86
=8600-86
=8514
五道脫式
32+89-65
=121-65
=56
3×6+9
=18+9
27
98-69+45×9
=98-69+405
=434
12+9-6×3
=12+9-18
=3
58-45+6÷2
=58-45+3
=16
四道方程
3+6x=27
6x=27-3
6x=24
x=4
5x÷4=10
5x=40
x=8
8x+15=55
8x=55-15
8x=40
x=5
9y÷3=69
9y=69×3
y=23
三道簡便
106×86
=(100+6)×86
=100×86+6×86
=8600+516
9116
25×4+75×4
=(25+75)×4
=100×4
=400
99×86
=(100-1)×86
=100×86-1×86
=8600-86
=8514