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19 19 What are the songs of good friends?
19 19 years of good friends, hand in hand,

Three, seven, three, seven, seven, seven, so close, let's come together four, four, six, six,

50-50% hands, ten friends remember.

Math nursery rhymes of junior students;

A, two digits plus or minus integer ten or digits of oral arithmetic.

Ten plus ten, one plus one,

The digits add up to ten, ten plus one;

Ten MINUS ten, one MINUS one,

There are not enough places, and there are ten places.

Second, the addition formula name memory

Every item in the formula has a name, and everyone writes it down.

Both sides of the plus sign are called addends, and the equal sign is called sum.