1. UNIT 1 WHOLE NUMBERS: Addition and Subtraction WHOLE NUMBERS: Addition and Subtraction McGraw-Hill/Irwin© 2007 The McGraw-Hill Companies, Inc. All rights reserved.

2. 1–11–1 Number Line

3. 1–21–2 Symbols

4. 1–31–3 Writing Whole Numbers Using Words

5. 1–41–4 Writing Whole Numbers Using Digits

6. 1–51–5 Aligning Digits by Place Value

7. 1–61–6 Adding Whole Numbers

8. 1–71–7 Add Tens First

9. 1–81–8 Add By Grouping

10. 1–91–9 Checking Addition

11. 1–10 Horizontal Addition

12. 1–11 Horizontal and Vertical Addition

13. 1–12 Use Smaller Groups of Numbers

14. 1–13 Use the Accountant’s Method

15. 1–14 Rounding Numbers

16. 1–15 Estimating Answers in Addition

17. 1–16 Subtraction

18. 1–17 Subtraction

19. 1–18 Checking Subtraction

20. 1–19 Subtracting Horizontally Subtract horizontally. Then find vertical column totals and subtract. Subtract the numbers from left to right. Check by subtracting the total of the subtrahends from the total of the minuends.

21. 1–20 Estimating Answers in Subtraction

22. 1–21 Using Problem-Solving Steps

23. 1–22 Problem-Solving in Business Determine whether there is a debit or credit balance for debits of $160.00, $2,650.50, $65.45, $492.11, and $745.73 and credits of $56.25, $643.90, $85.00, and $234.75. Note that debits are greater than credits, so the balance is a debit balance. Determine whether there is a credit or debit balance for debits of $35.88, $1,405.90, $332.19, and $38.55 and credits of $1,089.34, $42.76, and $882.10.