WRITTEN WORK

Copy the following sentences, writing the numbers in figures:

1. The moon is two hundred thirty-nine thousand miles from the earth.

2. Light travels one hundred eighty-six thousand miles in a second.

3. Sound travels one thousand ninety feet in a second.

Point off with commas, then write in words:

17. Seven hundred ten thousand

18. Nine hundred thousand four hundred sixty

Write in figures pointing off with commas:

19. Three hundred four thousand one hundred fifty-six 20. One hundred seventeen thousand seventy-five

21. Write the largest number you can with the figures 2, 7, 5, 4, 6, 9. Write the smallest.

22. What is the largest number you can make with six figures? The smallest?

Roman Numbers

(a) In what places have you seen Roman numbers used? (b) Write on the board the Roman numbers from one to twenty. What does I stand for in these numbers? V? X?

(c) Tell which of these numbers get their value from this rule: When a letter is followed by the same letter, the letters are added.

(d) Name three numbers which show that when a letter is placed after a letter of greater value, the sum of the letters is expressed.

(e) Give three numbers which show that when a letter is placed before a letter of greater value, the letter of smaller value is subtracted.

(f) The letter L stands for 50. Explain how each of the following Roman numbers gets its value:

1. XXVI 3. XLII 5. XXXIX 7. XLVII 9. XLI

2. XXXI 4. XXVIII 6. XLIV 8. XXXV 10. XLVIII Write as Roman numbers:

14. 37 16. 48

11. 27 13. 43 15. 41 17. 19 19. 50 21. 44 12. 39 18. 47 20. 33 22. 38 23. Write the Roman numbers from thirty through fifty. 24. What chapter comes just after Chapter XLIX? 25. What chapter comes just before Chapter XXXIV?

Addition

(a) You should be able to write the sums under any row of

these addition combinations in 15 seconds.

able to read all the sums in 30 seconds.

You should be

9

8

3 4 5 510061

441 901 201

(3) 7

7

8

8

(b) Name the sums rapidly:

79731 781

(2) 9

5

(c) Add: 6487, 1728, 3569, 4212, 3339, and 8539.

6487

1728

3569

4212

3339

8539

27874 Sum

Write the numbers in columns as shown.
Add the right-hand column first, starting at the
bottom. Think: 18, 20, 29, 37, 44. Write
4, and carry 4 to the next column.

Finish this explanation.

Check your work by adding downward, starting at the top of the right-hand column.

Do not leave any example in addition until you get the same answer adding both up and down.

In addition the numbers added are called addends.

Read the addends in this example.

Read the sum.

9. 26

10. 31 11. 99 12. 57 13. 83 14. 28

8888

15. 73

27