数字修约的规则íîaQj²w$obbs.3c3t.comz$'ue,.¶
1、íîaQj²w$obbs.3c3t.comz$'ue,.¶
修约间隔：指确定修约保留位数的一种方式，修约间隔一旦确定后，修约值即为该值的整倍数。íîaQj²w$obbs.3c3t.comz$'ue,.¶
2、íîaQj²w$obbs.3c3t.comz$'ue,.¶
数字修约的进舍规则íîaQj²w$obbs.3c3t.comz$'ue,.¶
（1）拟舍弃数字最左一位数小于5时，则舍去，即4舍5入。íîaQj²w$obbs.3c3t.comz$'ue,.¶
例如：13.2476（0.1）→13.2íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
13.2476（0.01）→13.25íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
13.2476（1）→13íîaQj²w$obbs.3c3t.comz$'ue,.¶
（2）拟舍弃数字最左一位数≥5时，而且后面的数字并非全部为0时，则进1，（保留末位数加1）íîaQj²w$obbs.3c3t.comz$'ue,.¶
例如：1167（100）→1200íîaQj²w$obbs.3c3t.comz$'ue,.¶
12*102íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
1167（10）→1170íîaQj²w$obbs.3c3t.comz$'ue,.¶
117*10íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
10.502（1）→11íîaQj²w$obbs.3c3t.comz$'ue,.¶
（3）似舍弃数字最左一位数为5，而后面无数字或全部为0时，若所保留的末位数为奇数（1、3、5、7、9）则进一，为偶数（2、4、6、8、0）则舍弃，即奇进偶不进。íîaQj²w$obbs.3c3t.comz$'ue,.¶
例如：2.050（0.1）→2.0íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
0.150（0.1）→0.2íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
1350（100）→1400íîaQj²w$obbs.3c3t.comz$'ue,.¶
14*102íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
0.0345（保留2位有效）0.034íîaQj²w$obbs.3c3t.comz$'ue,.¶
（4）负数修约同前íîaQj²w$obbs.3c3t.comz$'ue,.¶
（5）0.5单位修约时，将拟修约数乘以2，按指定数位依进舍规则修约，所得数值再除以2。íîaQj²w$obbs.3c3t.comz$'ue,.¶
AíîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
2AíîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
24（1）íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
A的修约值íîaQj²w$obbs.3c3t.comz$'ue,.¶
50.25íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
100.5íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
100íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
50.0（0.5）íîaQj²w$obbs.3c3t.comz$'ue,.¶
50.38íîaQj²w$obbs.3c3t.comz$'ue,.¶
100.76íîaQj²w$obbs.3c3t.comz$'ue,.¶
101íîaQj²w$obbs.3c3t.comz$'ue,.¶
50.5íîaQj²w$obbs.3c3t.comz$'ue,.¶
（6）0.2单位修约时，先乘5，再除以5。同上。方法：小数间隔，先乘后除。íîaQj²w$obbs.3c3t.comz$'ue,.¶
例如：将下列数修约到百位数0.2个单位（修约间隔20）íîaQj²w$obbs.3c3t.comz$'ue,.¶
AíîaQj²w$obbs.3c3t.comz$'ue,.¶
5AíîaQj²w$obbs.3c3t.comz$'ue,.¶
5A的修约值（100） íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
A的修约值（20）íîaQj²w$obbs.3c3t.comz$'ue,.¶
830íîaQj²w$obbs.3c3t.comz$'ue,.¶
4150íîaQj²w$obbs.3c3t.comz$'ue,.¶
4200íîaQj²w$obbs.3c3t.comz$'ue,.¶
840íîaQj²w$obbs.3c3t.comz$'ue,.¶
842íîaQj²w$obbs.3c3t.comz$'ue,.¶
4210íîaQj²w$obbs.3c3t.comz$'ue,.¶
4200íîaQj²w$obbs.3c3t.comz$'ue,.¶
840íîaQj²w$obbs.3c3t.comz$'ue,.¶
又例：将下列数修约到个位数的5个单位。方法：整数间隔，先除后乘（钢筋就是这样修约）íîaQj²w$obbs.3c3t.comz$'ue,.¶
AíîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
A/5íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
A/5（1）íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
A（5）íîaQj²w$obbs.3c3t.comz$'ue,.¶
442.5íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
88.5íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
88íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
440íîaQj²w$obbs.3c3t.comz$'ue,.¶
442.52íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
88.504íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
89íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
445íîaQj²w$obbs.3c3t.comz$'ue,.¶
541.9íîaQj²w$obbs.3c3t.comz$'ue,.¶
108.38íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
108íîaQj²w$obbs.3c3t.comz$'ue,.¶
íîaQj²w$obbs.3c3t.comz$'ue,.¶
540íîaQj²w$obbs.3c3t.comz$'ue,.¶
243.5íîaQj²w$obbs.3c3t.comz$'ue,.¶
48.72íîaQj²w$obbs.3c3t.comz$'ue,.¶
49íîaQj²w$obbs.3c3t.comz$'ue,.¶
245íîaQj²w$obbs.3c3t.comz$'ue,.¶
347.5íîaQj²w$obbs.3c3t.comz$'ue,.¶
69.50íîaQj²w$obbs.3c3t.comz$'ue,.¶
70íîaQj²w$obbs.3c3t.comz$'ue,.¶
350íîaQj²w$obbs.3c3t.comz$'ue,.¶
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