常见分数、小数、百分数互化
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1 5 2 5 3 5 4 5 1 50 1 100
来自百度文库
=0.2 = 20% =0.4 = 40% =0.6 = 60% =0.8 = 80% =0.02 = 2% =0.01 = 1%
记忆方法: (1)可以用一张卡 片盖住左边的分 数,看着小数说出 与相等的分数,再 交换。 (2)C列分数化小 数的记法:分子乘 5,小数点向左移动 两位。 (3)D、E两列分数 化小数的记法:分 子乘4,小数点向左 移动两位。
常见分数、小数、百分数互化
A列 1 =0.5 = 50% 2 1 =0.25 = 25% 4 3 =0.75 = 75% 4 B列 1 8 3 8 5 8 7 8 1 10 3 10 7 10 9 10 =0.125 = 12.5% =0.375 = 37.5% =0.625 = 62.5% =0.875 = 87.5% =0.1 = 10% =0.3 = 30% =0.7 = 70% =0.9 = 90% 1 20 3 20 7 20 9 20 11 20 13 20 17 20 19 20 C列 = 0.1 = 0.2 = 0.4 = 0.5 = 0.6 = 0.7 = 0.9 = 1 D列 1 = 0.04 25 2 = 0.08 25 3 = 0.12 25 4 = 0.16 25 6 = 0.24 25 7 = 0.28 25 8 = 0.32 25 9 = 0.36 25 11 = 0.44 25 12 = 0.48 25 E列 13 = 0.52 25 14 = 0.56 25 16 = 0.64 25 17 = 0.68 25 18 = 0.72 25 19 = 0.76 25 21 = 0.84 25 22 = 0.88 25 23 = 0.92 25 24 = 0.96 25 好学生全部背熟, 其他至少熟记A、B 列
常见分数、小数、百分数互化
A列 1 =0.5 = 50% 2 1 =0.25 = 25% 4 3 =0.75 = 75% 4 B列 1 8 3 8 5 8 7 8 1 10 3 10 7 10 9 10 =0.125 = 12.5% =0.375 = 37.5% =0.625 = 62.5% =0.875 = 87.5% =0.1 = 10% =0.3 = 30% =0.7 = 70% =0.9 = 90% 1 20 3 20 7 20 9 20 11 20 13 20 17 20 19 20 C列 = 0.1 = 0.2 = 0.4 = 0.5 = 0.6 = 0.7 = 0.9 = 1 D列 1 = 0.04 25 2 = 0.08 25 3 = 0.12 25 4 = 0.16 25 6 = 0.24 25 7 = 0.28 25 8 = 0.32 25 9 = 0.36 25 11 = 0.44 25 12 = 0.48 25 E列 13 = 0.52 25 14 = 0.56 25 16 = 0.64 25 17 = 0.68 25 18 = 0.72 25 19 = 0.76 25 21 = 0.84 25 22 = 0.88 25 23 = 0.92 25 24 = 0.96 25 好学生全部背熟, 其他至少熟记A、B 列
1 5 2 5 3 5 4 5 1 50 1 100
=0.2 = 20% =0.4 = 40% =0.6 = 60% =0.8 = 80% =0.02 = 2% =0.01 = 1%
记忆方法: (1)可以用一张卡 片盖住左边的分 数,看着小数说出 与相等的分数,再 交换。 (2)C列分数化小 数的记法:分子乘 5,小数点向左移动 两位。 (3)D、E两列分数 化小数的记法:分 子乘4,小数点向左 移动两位。