Kerry used a balance scale and reasoned that since $0.45 and $0.40 would equal $0.85, she needed to subtract 3 cents from 40 cents to get her answer of $0.37 (see fig. 3c ).
Kerry used a balance scale and reasoned that since $0.45 and $0.40 would equal $0.85, sheneeded to subtract 3 cents from 40 cents to get her answer of $0.37 (see fig. 3c ).