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ORAL OR WRITTEN WORK

Subtract without copying:

1. 99 9. 109 17. 9999 25. 1099

33. 9249

10. 109 18. 9999

Reading and Writing Five-Figure Numbers

(a) Read 105; 9785; 7009; 4075; 9990.

(b) On the board write the numbers from 9990 to 9999.

The next number after 9999 is 10,000. We read this number ten thousand.

(c) 10,001 is read ten thousand one.

Read: 10,002; 10,009; 10,010; 10,100; 10,110; 10,120; 20,020; 75,125; 50,079.

(d) We point off numbers of five figures with a comma. How many figures are at the right of the comma? The figures at the left of the comma are thousands. (e) Read:

6. Seventeen thousand sixty.

7. Eighty thousand three hundred thirty-three.
8. Seventy-two thousand six hundred five.

9. Write ten numbers with the figures 3, 6, 5, 4, 8. Which is the largest of these numbers? The smallest? 10. Write the largest number you can with five figures; the smallest number with five figures.

Subtraction: Continuous Carrying

Subtract: 90,090 - 75,386.

14,704

Change 0 to 10 and 5 to 6. 6 and 4 make 10.
Change 7 to 8. 8 and 1 make 9.