CHAPTER II READING AND WRITING NUMBERS ORAL EXERCISES 1. What is another name for ten ones? Ten and one are how many? Write eleven. In 11 what does the 1 at the right mean? the 1 at the left? In 23 what does the 3 mean? What does the 2 mean? 2. What is the largest number that can be written with one figure? What is the largest number that can be written with two figures? 3. Count by tens from ten to one hundred. 4. In this number picture, if we call the picture on the right one, what shall we call the middle picture ? How many ones make a 100 ten? How many tens in the large picture? 5. We call ten tens one hundred. We write one hun dred, 100; two hundred, 200; three hundred, 300. 6. Write four hundred. How many figures do you use? The figure at the right shows how many ones there are. The second figure shows how many tens there are. The figure at the left shows how many hundreds there are. 7. This picture shows 1 hundred, 1 ten, and 1 one; that is, one hundred eleven, written 111. 8. Write two hundreds, two tens, and two ones, or two hundred twenty-two. 9. Write one hundred twenty-three. What does each figure mean? 10. Read the following 100 10 1 numbers and tell what each figure means, thus: three hundred thirty-three means 3 Write these numbers in figures and place them in columns, ones under ones, tens under tens, and hundreds under hundreds : One hundred, two tens, three ones Six hundred fifty-nine Nine hundred seventy-eight Seven hundred Nine hundred one Nine hundred ten Eighty Six hundred thirty-three Three hundred six Three hundred sixty One hundred eighty ROMAN NUMERALS ORAL EXERCISES 1. The Romans used seven capital letters in writing numbers. By repeating and combining these letters all the other numbers were written. 2. Read these numbers. What kind of numbers are these? I II III IV V VI VII VIII IX X XI XII. Where have you seen them used? 3. 20 is written XX. How is 30 written? 4. If one or more letters of a smaller value are placed after another letter, the number formed is equal to their sum, thus: VI means 5 + 1; XII means 10+ 2; XVI means 10+ 5+1. 5. Read the numbers of these chapters: 6. If a letter of smaller value is placed before another letter, the number formed equals their difference, thus: IV means 5-1; IX means 10-1. 8. Write the numbers from X to XX. Write the numbers from XXX to XL. 1. Write these numbers in Roman numerals: 2. Change these Roman numerals to figures: IX; XIX; XXV; XL; XLV; LVII; LXXV; XC; CX; XCI; LXXXVIII. ADDITION ORAL EXERCISES 1. Add 1 to each number from 10 to 20, giving the sums only. 2. In the same way, add 2 to each number from 10 to 20; add 3 to each number from 30 to 40; add 4 to each number from 80 to 90; add 5 to each number from 50 to 60; add 6 to each number from 20 to 30; add 7 to each number from 10 to 20; add 8 to each number from 70 to 80; add 9 to each number from 10 to 20. 3. Add 2 to every number between 11 and 93 that ends in 2, as 12, 22, 32, and so on. Give the sums only. 4. Add 3 to every number between 12 and 94 that ends in 3. 5. In 14 there are how many tens? How many ones? In 20 there are how many tens? 6. 20 and 10 are how many? 20 and 10 and 4 are how many? In adding 20 and 14 you may say, "Twenty and ten are thirty and four are thirty-four." In this way add the following: |