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History Of Math

Addition

Subtraction

Multiplication

Division

Number Notation

Multiplication Table

Divisibility Rules

Subtraction – an operation of finding an addend by a sum and another addend: 17 – 6 = 11.  Here 17 is a minuend,  6 – a subtrahend,  11 – the difference. Math tricks 1: subtracting by oversubtracting 251-85 =(151+100)-85 =151+100-85 =151+15 =166 In this example,251 is break into 151 and 100 Math tricks 2: subtracting by adding to each number 251-85 =(151+100)-85 =151+100-85 =151+15 =166 In this example,251 is break into 151 and 100 Math tricks 3: subtracting by subtracting to each number 831-104 =(831-4)-(104-4) =827-100 =727 In this example,251 is break into 151 and 100 Easy way to check your answer: Check the answer by working backward Example: 543 - 295 = 248 Add 248 to 295,and see whether you can get 543 back or not. 248 + 295 = 543 If the answer(eg.248) add with one of the numbers(eg.295) give you another numbers(eg.543),then your aswer is correct.

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