Squaring numbers ending in 1

Here’s a simple trick to square any number that ends in 1. Subtract 1 from the number. Square the difference. (Squaring of such number is easy as it ends in ‘0’) Add the difference twice to its square. Add 1. Example: If the number to be squared is...

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Divisibility Rules

Dividing by 3 Add up the digits: if the sum is divisible by three, then the number is as well. Examples: 111111: the digits add to 6 so the whole number is divisible by three. 87687687. The digits add up to 57, and 5 plus seven is 12, so the original number is divisible...

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Number Notations for Maths

Hierarchy of Decimal Numbers Number Name How many 0 zero 1 one 2 two 3 ...

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Subtraction Tricks

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...

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Addition Tricks

Addition -an operation of finding a sum of some numbers: 21 + 5 = 26. Here 21 and 5 – addends,  26 – the sum. If addends are changed by places, a sum is saved the same: 21 + 5 = 26 and 5 + 21 = 26. Math tricks 1: Adding by breaking apart a number Example: 137+85 =(122+15)+85 =122+100 =222 In...

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History of Maths

An overview Mathematics starts with counting. It is not reasonable, however, to suggest that early counting was mathematics. Only when some record of the counting was kept and, therefore, some representation of numbers occurred can mathematics be said to have started. In...

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Division Tricks

An operation of finding one of factors by a product and another factor: 48÷4 = 12. Here  48  is a dividend,  4 – a divisor,  12 – the quotient. At dividing integers a quotient can be not a whole number. Then this quotient can be present as a fraction....

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IMPRESS YOUR FRIENDS WITH MENTAL MATH TRICKS

Easy Cal Tricks Being able to perform arithmetic quickly and mentally can greatly boost your self-esteem, especially if you don't consider yourself to be very good at Math. And, getting comfortable with arithmetic might just motivate you to dive deeper into other things...

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