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Math Chapter 2.1 - Compatible numbers Find pair of numbers...

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2.1 Mental Math Mental math: -Solidifies understanding of place value, as in the problem 52x10=_ -Teaches how numbers can be rearranged and manipulated according to the any-order and distributive property. -Demonstrates how the same answer can often be reached in different ways some dramatically easier. Methods: Rearranging- 50 + 37 + 60 = 110 + 37 = 147 Split numbers as sums or products- 4 x 113= (4 x 100) + (4 x 13)
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Unformatted text preview: Compatible numbers- Find pair of numbers which are easily combined. 25 x 17 x 4 = 100 x 17 = 1700 Compensation- convert the problem to an easier one with the same answer. 99 + 34 = 133 (pg.45) Left to right calculations may be easier- 309 + 607 = 900 + 16 = 916 Methods by multiplying and dividing by 4, 5, 8, 9, 10, 25, 100....
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