Figuring tips, baseball statistics, extrapolating energy consumption with population growth, arithmetic competitions, currency conversions for price comparison, price comparisons given a unit price, the price of 2400 grams of apples...
Most of these you can do with division instead, and some of them you have to, but it's harder. The competitions are probably the most effective way to motivate some students to be really excellent; I don't know how effective they are at raising the average competence level.
Most of these you can do with division instead, and some of them you have to, but it's harder. The competitions are probably the most effective way to motivate some students to be really excellent; I don't know how effective they are at raising the average competence level.