for instance 459 164 add add the 400 and 100 hundreds 500 add the 50+ 60 110 add the 9+4 13 now add those (right to left) 643 http://www.nychold.com/em-arith.html
grade 2 186 grade 3 259 how many more were sold bt grade 3 than by grade 2? 73 answer why aren't any of the tens regrouped to subtract the ones?
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