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What are the contents of the operation of mathematical numbers in primary schools?
Four operations of integers, decimals and fractions and elementary arithmetic within three steps.

Simple calculation of integers, decimals and fractions.

Mixed operation of integer, decimal and fraction.

One-step calculation and two-step calculation equations.

The relationship between fractions, percentages and decimals.

Polymerization unit of weight, length, area and volume.

Area and volume calculation.

Approximate calculation of decimals.

Rewrite in units of 10 thousand and 100 million.

About this much.

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