Math 4 2-Day: Tips, Tricks, Topics and Techniques in Everyday Mathematics by Mic
23,64 €
How quickly can you prove that 54,879,654 + 52,418,793 = 107,298,447?. How about instantly shouting out the square of 35?. Best of all, you can do it without having to create a math problem - just yell the answer out!
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