Of course. Carry addition within 20 is the method of "rounding to ten", "rounding to decimal, dividing to large". Add the decimal to 10, and then calculate it, so you can divide it by a large number or a decimal. This is the addition and subtraction between the division of mathematics and the ten-point method in grade one, and within 10 and 20. The formula is to look at large numbers, divide them into decimals, make up ten, and add the remainder.