How to solve examples in a column

Examples with multi-valued numbers are best solved in a column: it’s both more convenient and faster, and the result will be correct. To make the correct calculations, you must adhere to a certain algorithm.

Instruction manual

one

Write the desired example in a column so that the units of the second term, factor, or subtracted are under the units of the first term, factor, or decrease, respectively. Dozens, hundreds, thousands, etc. should also be located. Put a horizontal line under which you will record the result.

2

When you perform the addition action, then start adding up units, then tens, hundreds, etc. If, when adding up any bit units, their sum turns out to be less than 10, then under the bar, write this number under the corresponding bit. If the sum is more than 10, then write down the number of units of the resulting number, and write the number of tens in pencil over the digits of that category, the numbers of which you will add. Add this number when adding the numbers of the next digit. So continue until the last digit in the number. Column multiplication is performed in a similar way, only using the multiplication action.

3

When subtracting, also start with units. If the number of a particular category is less than the number subtracted, then borrow from the next category 1 dozen or a hundred, etc. and make the calculations. Put a dot over the number you borrowed, so as not to forget. When performing actions with this discharge, subtract already from the reduced number. Write the result under the horizontal line.

4

Check the correctness of the calculations. If you added, then subtract one of the terms from the sum received, you should get the second. If you subtracted, then add the resulting difference to the subtracted, it should turn out to be reducible.

note

Be sure the digits of numbers must be under each other.