Elementary arithmetic, with brief notices of its history... by Robert Potts.

83
RESULTS, HINTS, ETC., FOR THE EXERCISES.
NOTATION AND NUMERATION.
I.
1. 56: 65. 2. 304: 596. 3. 7707: 9273. 4. 27450. 5. 198567. 6. 5,500,505 -7. 95,059,000. 8. 710,710,710. 9. 1,000,100,000.
II.
1. Fifty-seven: seventy-five: eighty: forty-five: twenty-one: seventy-nine.
2. One hundred and one: three hundred: four hundred and twenty-five: six hundred and two: six hundred and twenty: nine hundred and ninety-nine. 3. One
thousand and one: one thousand one hundred: one thousand and ten: four thousand seven hundred andc eighty-three: two thousand nine hundred and nine: one
thousand eight hundred. 4. Twenty-one thousand.: twenty thousand one hundred:
forty-eight thousand seven hundred and sixty-five: eighteen thousand and nine:
eighteen thousand and ninety: ninety thousand and nine. 5. One hundred and
twenty-three thousand four hundred and fifty-six: seven hundred thousand and
nine: seven hundred and nine thousand: one hundred thousand one hundred: five
hundred and five thousand and fifty. 6. Seven millions, six hundred and fifty-four.
thousand, three hundred and twenty-one: one million, two thousand and three:
five million and eighty-one thousand: nine million, eighty thousand, seven hundred.
and six. 7. Twenty-nine million, three hundred and fifty-eight thousand, seven
hundred and sixty-four: fifty million, eight hundred thousand, seven hundred:
eighty million, fifty-three thousand and seven. 8. Five hundred and three million,
one hundred thousand, nine hundred and fifty: twenty billion, one hundred million,
ten thousand and ten. 9. One thousand billion, two hundred million, three thousand and one: five thousand seven hundred and eighty-six billion, seven hundred
and thirty-two thousand, one hundred and ninety-five million, nine hundred and
forty-six thousand, four hundred and seventy.
III.
2. One instance, the number 7, can be made up of 6 and 1, 5 and 2, 4 and 3, and
in like manner the rest. 3. Proceed as in the last example. 4. 43210 is the largest,
and 12340 is the smallest number. 5. One hundred thousand tens: ten thousand,
hundreds: one thousand thousands, ten tens of thousands. 6. First, when only one
figure is employed there are 3 nunmbers; when 2 figures 9, when 3 figures 18, and
when 4 figures 18, making on the whole 48 different numbers.
ADDITION AND SUBTRACTION.
I.
1. 137. 2. 1,201. 3. 14,611. 4. 30,000. 5. 233431. 6. 1,429051. 7.
29,900000. 8. 5,213513. 9. 3,315931. 10. 6263,576043.
II.
1. See Art. 3. 2. See Art. 2. 3. See Art. 2. 4. Place 5 for the middle.
figure. 5. 24 different numbers can be formed with 4 figures.