When doing subtraction, it is not enough to subtract one place from one place, so we have to borrow one from ten places to subtract. This is called the method of breaking ten.
The "ten-point method" is often used as the test site for examination. If children don't understand the "ten-point method", they can't do such questions at all during the exam; Secondly, the essence of learning to use the "ten-supplement method" is to let children experience the beauty of ten. By using this calculation method, they can see the numbers quickly without counting them one by one.
The method of "adding up to ten" can exercise children's ability to synthesize and decompose logarithm, which is helpful to learn mathematical calculation in the future. As the final exam is just around the corner, the following exercise questions are suggested for parents in need to print out and let their children practice 10~ 15 every day.
Addition and subtraction algorithm
1, integer:
(1) Same number alignment
(2) Counting from the unit
(3) When it is added to dozens, it will be pushed to a higher position; If the subtraction is not enough, subtract 1 from the high position. When this number is added to 10, it will decrease.
2. Decimal number:
(1) decimal point alignment (that is, same digit alignment);
(2) calculation according to the law of integer addition and subtraction;
(3) aim the decimal point at the horizontal line in the number and point the decimal point;