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138+106=106+138=106+(140−2)=106+140−2=246−2=244138 plus 106 equals 106 plus 138 equals 106 plus open paren 140 minus 2 close paren equals 106 plus 140 minus 2 equals 246 minus 2 equals 244 3. Subtraction by Rounding Up : Technique : Round and add the difference back ( Step-by-step :

94−61=94−(60+1)=94−60−1=34−1=3394 minus 61 equals 94 minus open paren 60 plus 1 close paren equals 94 minus 60 minus 1 equals 34 minus 1 equals 33 The complete results for the four expressions are:

: Swap the terms and express the second as a difference ( Step-by-step :