ble, double the leaf down from top to bottom, so as to cover the number to be subtracted. This practice will be sure to attract and instruct. You take away the number that you cover with the folded paper, and of course the rest remain. SECTION I. Double the leaf from top to bottom, so as to cover one. Double the leaf down from top to bottom so as to cover two, three, and five in the respective Examples. Take Two from Three, Lesson 1.-Take 1 from 1 there remains 0 1 from 2 there remains 1 1 from 3 there remain 2 1 from 4 there remain 3 1 from 5 there remain 4 1 from 6 there remain 5 1 from 7 there remain 6 1 from 8 there remain 7 1 from 9 there remain 8 1 from 10 there remain 9 Lesson 2.-Take 2 from 2 there remains O 2 from 3 there remains 1 2 from 4 there remain 2 2 from 5 there remain 3 2 from 6 there remain 4 2 from 7 there remain 5 Lesson 5.-Take 5 from 5 there remains 0 5 from 6 there remains 1 5 from 7 there remain 2 5 from 8 there 5 from 9 there 5 from 10 there Lesson 6.-Take 6 from 6 from 6 from remain 3 remain 4 remain 5 6 there remains O 7 there remains 1 8 there remain 2 6 from 9 there remain 3 6 from 10 there remain 4 Lesson 7.-Take 7 from 7 there remains 0 7 from 8 there remains 1 7 from 9 there remain 2 7 from 10 there remain 3 Lesson 8.-Take 8 from 8 there remains 0 Lesson 9.-Tuke 9 from 9 there remains 0 9 from 10 there remains 1 Sum 1.-Now you can take 3 from 6, and see how many remain. Do it in the same way, and put the highest number first, that is six. Now say, take three from six and there remain Now add what you have taken out to the remainder, and you have the proof as the top. This you can see to be a sure way of taking a smaller number from a larger one, and knowing what remain. But let us do the same sum in another way. |