1. Everyday Math Grade 4 – Lesson 3.10 Open Sentences Copyright © 2010 Kelly Mott

2. OPEN SENTENCES Copyright © 2010 Kelly Mott

3. A number sentence is open if it has a VARIABLE. EXAMPLE 12 + x = 15 Number Sentences Copyright © 2010 Kelly Mott

4. A VARIABLE is a letter or symbol that stands for a missing number. 12 + x = 15 Number Sentences Copyright © 2010 Kelly Mott

5. To solve sentences with variables, you want to get the variable by itself. Number Sentences Copyright © 2010 Kelly Mott

6. Watch and see how to get the variable alone. Number Sentences Copyright © 2010 Kelly Mott

7. ADDITION SENTENCES Copyright © 2010 Kelly Mott

8. 51 = n + 29 n = _______ Open Number Sentences Copyright © 2010 Kelly Mott 12 + b = 55 b = ________ - 29 - 12

9. 33 = s + 24 s = _______ Open Number Sentences Copyright © 2010 Kelly Mott 67 + y = 102 y = ________

10. SUBTRACTION SENTENCES Copyright © 2010 Kelly Mott

11. 17 = z - 8 z = _______ Open Number Sentences Copyright © 2010 Kelly Mott t - 9 = 14 t = ________ + 08 - 14 If you get a negative number, switch the sign

12. 41 = k - 18 k = _______ Open Number Sentences Copyright © 2010 Kelly Mott f - 7 = 23 f = ________ If you get a negative number, switch the sign

13. 5 = 18 - k k = _______ Open Number Sentences Copyright © 2010 Kelly Mott 41 - f = 23 f = ________ If you get a negative number, switch the sign

14. 16 = 38 - k k = _______ Open Number Sentences Copyright © 2010 Kelly Mott 17- f = 11 f = ________

15. MULTIPLICATION SENTENCES Copyright © 2010 Kelly Mott

16. 18 = 2 * x x = _______ Open Number Sentences Copyright © 2010 Kelly Mott 4 * w = 24 w =________ 2244

17. 18 = 2 * x x = _______ Open Number Sentences Copyright © 2010 Kelly Mott 4 * w = 24 w =________

18. 77 = 7 * y y = _______ Open Number Sentences Copyright © 2010 Kelly Mott 5 * h = 60 h =________

19. DIVISION SENTENCES Copyright © 2010 Kelly Mott

20. 7 = 21/x x = _______ Open Number Sentences Copyright © 2010 Kelly Mott 18/w= 9 w =________ 77 99

21. 6 = 24/s s = _______ Open Number Sentences Copyright © 2010 Kelly Mott 36/f= 12 f =________

22. x = 7 * 3 x = _______ Open Number Sentences Copyright © 2010 Kelly Mott 8 * 8 = z z =________

23. y = 21/3 y = _______ Open Number Sentences Copyright © 2010 Kelly Mott 14/2= t t =________