If you’re looking for a quicker way to do addition, use this chart to group numbers. Put your list of numbers on paper and then follow this example:

Numbers Pair Add Pair Again Add Total
17 (a)
151 (d)
23 (a) (a) 23 + 17 = 40 (e)
24 (b) (b) 24 + 66 = 90 (f) (e) 190 + 90 = 280
205 (c) (c) 205 + 75 = 280 (f) (f) 280 + 40 = 320 280 + 320 = 600
39 (d) (d) 39 + 151 = 190 (e)
75 (c)
66 (b)

About This Article

This article is from the book:

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Ron Woldoff is the founder of National Test Prep and has taught SAT, ACT, PSAT, GMAT, and GRE prep courses at Arizona high schools and universities.

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