The numbers have the same numeric value, yes. But when applied to a measurement, or calculated value, 7.40 indicates a greater precision than 7.4. In both cases, the error is assumed to be roughly 1/2 of the last digit shown, or less.
Yes.
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7.4
7.40
74 x 10 = 740
74
74
100% = 740 10% = 74 5% = 37 740 - 74 - 37 = 740 - 111 = 629
2 x 37, or 1 x 74, or 0.5 x 158, or 0.1 x 740. The possibilities are endless.
There are infinitely many possible answers. One of these is 740*0.1
740 /\ 10 74 /\ /\ 5 5 2 31
10%*74 (10/100)*74 (10*74)/100 740/100 7.4
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no, you can divide it by 2 or 74, for instance
74.
Dividing by ten just take a 0 off the end - so 7400 becomes 740 as in 7400 / 10 = 740 seven hundred and forty