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30 Tricks to to become a Mental Math Smart in 2011- Part 5 (video)

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This is my fifth blog of tips to do well in math problems. In this blog you will find some tips to do math questions easy. These tricks are easy to remember to do all math calculations: 25. Squaring a two-digit number ending in 5 To find the square of a two-digit number ending in 5, take the first digit, multiply by itself plus one, and then put "25" after it. Example: To find 652, compute 6 * 7 = 42, and then write "4225" as the answer. Example: To find 252, compute 2 * 3 = 6, and then write "625" as the answer. 26. Multiplying two numbers when a round number is halfway between them Suppose you are multiplying two moderately large numbers, 84 and 76. Note that the number 80 is halfway between the two. This means that 84*76 can be rewritten as (80 + 4)(80 - 4) which simplifies to two-80 and two - 4, which is easier to figure out: 6400 - 16 = 6384. 27 .   20 Multiplications:       24       X4...