There should be nine more that can be understood this way. Lao Wang ate an egg, took half of it and the rest, so it was equivalent to taking an egg. 10- 1=9, so there were nine eggs in the pot.

Half of the whole may not be ten eggs, but a single egg. At this time, eating half is eating half an egg, and taking half is taking the rest. Then the answer is nine eggs.

Continue to shake: Maybe this half and the other half are the same half, that is, after eating half, the other half fills the stomach, so there are many situations:

(1) Eat five (put these five away in your stomach), and there are five left;

In the same way, eat half and there are nine and a half left.

Extended data

Subtraction by abdication, a special mathematical term, can also be called subtraction by borrowing. That is, when two numbers are subtracted and the number of digits to be subtracted is not enough, borrowing the previous digit is equivalent to adding 10 to this digit, and then calculating.

Using the addition and subtraction relationship, as long as we know that 9 plus a few equals 13, we can deduce that 13 minus 9 equals several. The basis of this algorithm is that students will write the corresponding subtraction formula according to the addition formula, find out the unknown in brackets and calculate the carry addition within 20.