ENJOY THE MENTAL MATHS Squaring a Number That Ends with 5 - TopicsExpress



          

ENJOY THE MENTAL MATHS Squaring a Number That Ends with 5 Discard the 5, and multiply the remaining number by itself plus one. Then tack on a 25 (which as in the previous section, is 5x5). For example, 65x65. Discarding the 5 from 65 leaves us with 65 = 6. Multiplying 6 by itself plus one gives us 42 (6x7 = 42). Tacking on a 25 yields 4225, so 65x65=4225. For example, 45x45 can be written as [4x5][5x5]thus 45x45 = 2025
Posted on: Mon, 07 Oct 2013 14:19:16 +0000

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