Ten MINUS nine, a few plus one. Ten MINUS seven, a few plus three. Ten MINUS five, a few plus five. A dozen MINUS three, a few plus seven.

Ten MINUS eight, a few plus two. Ten MINUS six, a few plus four. Ten MINUS four, a few plus six. A dozen MINUS two, a few plus eight.

Extended data:

Breaking the historical background of 10 law;

Subtraction is a mathematical operation that represents the operation of removing an object from a collection. Its symbol is the minus sign (? )。 For example, in the picture on the right, there are five? Two apples, five apples, two were taken away, leaving three apples. So 5? 2 = 3。 Subtraction is to remove or reduce physical quantities and abstract quantities with different objects (including negative numbers, fractions, irrational numbers, vectors, decimals, functions and matrices).

Subtraction follows several important patterns. It is anti-commutative, which means that changing the order will change the sign of the answer. It is not associative law, that is, when a subtraction exceeds two numbers, the order of subtraction is very important. Subtracting 0 does not change a number. Subtraction also follows predictable rules related to addition and multiplication.