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Effective Numbers of Junior One Mathematics
Example 0. 123 has three significant figures (123).

0.00 123 (123) has three significant figures.

0. 1023 (1023) has four significant digits.

1230 (1230) has four significant figures.

The number of significant digits refers to the number from the first non-zero digit on the left to the last digit (including zero), regardless of the position of the decimal point.