By John Tobey; Jeffrey Slater

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3 Subtraction of Quick Recall of Subtraction Facts It is if you can subtract quickly. See if you can do Example 1 correctseconds or less. Repeat again with Practice Problem 1. Strive to obanswers correctly in 15 seconds or less. helpful ly in 15 tain all • EXAMPLE (a) 8 - (a) 8 2 Subtract 1 13-5 (b) 13 (b) -2 - Practice Problem 9 (b) (a) - (e) 16 -- 16 (e) - 8 16 7 17 (c) - 5 Subtracting Whole When we 15 - 8 12 - Is 15-8 Subtract. 1 -6 (d) (d) 4 8 6 - 4 12 (c) 5 12 (c) 14 (d) 8 18 (e) - - 9 Numbers When Borrowing Not Necessary numbers with more than two digits, in order to keep track up the ones column, the tens column, the hundreds colNote that we begin with the ones column, and move from subtract of our work, we umn, and so on.

Number 600 + 70 7000 8. + in standard notation. 10. 1 + 600 + 50 + 15. 000 820,310,574 2 + 6000 + 200 500 + 90 + 13. 30,000 6 11. + 9000 + 700 + 30 + 16. 900,000 + 50,000 + 40 + 3 9000 + 800 + 14. 60,000 60 + 3 + 7000 + 200 + 4 7 Verbal and Writing Skills 17. In the number 56,782 (a) What digit tells the (b) What is number of hundreds? the value of the digit 5? (a) number 945,302 What digit tells the number often thousands? (b) What 19. In the Write a 21. 53 10 is (a) number 318,172 What digit tells the number (b) What 18.

1720? (c) What was (a) To read the umn the estimated population of chart, first look for under 1780. The number Rhode Maine on the is Island in 1700? left. 49. In this chart Read across to the col- 49 means 49 thousands. 49 thousands =» 49,000 (b) Read for (c) the line of the chart for Plymouth and Massachusetts. The number Plymouth and Massachusetts under 1720 is 91. This means 91 thou- sands. We Read the line of the chart for will write this as 91,000. land under 1700 To Think About is 6. This Rhode Island.