Public school methods . use there are eight twos in sixteen. Tell us that at the board. The child writes, 8X2 ?= 16. Suppose, though, that we do not know how many twosthere are in a certain number? How can we find out? We can divide. Divide what? We can divide the number by two. Show me, by dividing, how many twos there are in 62. In 84. I have 68 pints of milk. Show me by division howmany quarts I have. In the same way show me howmany quarts in 88 pints. In 42 pints. Who now can make a rule for us that will always helpus to change pints to quarts very quickly? Make your rulevery exact a
Public school methods . use there are eight twos in sixteen. Tell us that at the board. The child writes, 8X2 ?= 16. Suppose, though, that we do not know how many twosthere are in a certain number? How can we find out? We can divide. Divide what? We can divide the number by two. Show me, by dividing, how many twos there are in 62. In 84. I have 68 pints of milk. Show me by division howmany quarts I have. In the same way show me howmany quarts in 88 pints. In 42 pints. Who now can make a rule for us that will always helpus to change pints to quarts very quickly? Make your rulevery exact and word it carefully. To change pints to quarts, divide the number of pintsby two. Following this same plan, the children will readily tellhow to change quarts to gallons and then the rule may bedeveloped that to change from a quantity of a certain orderto a quantity of a larger order we must always divide. It is a very simple matter to secure from the childrenthe rule that to change from a quantity of a certain order. Third Year Number Work 269 to one of a lower order we must multiply. Liquid measuremay be taken up first and the rule for changing from gallonsto quarts quickly developed, as follows: Marjorie, how many quarts in one gallon? Howmany quarts in two gallons, class? In four gallons?In six gallons? Tell me how you find it. In one gallon there are four quarts, so in six gallonsthere are six times as many quarts. I have a certain number of gallons of oil. I am notgoing to tell how many, but I want to know how I can findout how many quarts there are. You must multiply the number of gallons by four. Put that in the form of a rule. To change gallons to quarts, multiply the number ofgallons by four. The rule for changing quarts to pints may now be devel-oped. Dry measure may be taken up next, then money,then linear measure. Rules should be developed in eachcase until it is perfectly clear to the children that when wechange a quantity of one order to a quantity of higherorde
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