1, aligned with the same number.
2. Starting from the unit.
3. When the number of digits reaches 10, enter 1 into ten digits.
Quick calculation skills II. Write a two-digit subtraction and remember three things.
1, aligned with the same number.
2. Reduce from the unit.
3. If the number of digits is not enough, subtract 1 from the number of digits, add 10 to the number of digits and then subtract.
Quick calculation skill 3. Calculation rules of mixed operation.
1, in the formula without brackets, only addition and subtraction or multiplication and division can be performed from left to right.
2. In the formula without brackets, if there are multiplication and division and addition and subtraction, the multiplication and division should be calculated first, and then the addition and subtraction should be calculated.
3. If there are brackets in the formula, count the brackets first.
Read four-digit or four-digit fast calculation skills.
1, read from the high place in order, thousands to thousands, hundreds to hundreds, and so on.
2. There is a zero or two zeros in the middle, and only one "zero" is read.
No matter how many zeros there are, don't read the last number.
Quick calculation skills five-digit or four-digit writing.
1, written in order from the high order.
2. Write a few words in thousands, a few words in hundreds, and so on. Write "0" in the middle or at the end.
Three items should also be paid attention to in the fast calculation skill of 64-digit subtraction.
1, aligned with the same number.
2. Reduce from the unit.
3. Which figure is not enough to reduce? Retract 1 from the previous position, add 10 to the standard position, and then subtract.
Quick calculation skill seven. Multiplication rule of one digit multiplied by multiple digits.
1, starting from single digits, multiply each digit in multiple digits by one digit in turn.
Whoever gets the highest score will be promoted several times.