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Solving Variable Expressions with Order of Operations | Math Warm-Up

Get ready to practice evaluating variable expressions by substituting numbers and following the order of operations in this educational warm-up video. Learn how to find the values of variables and solve equations step by step. Watch and master math concepts!

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Solving Variable Expressions with Order of Operations | Math Warm-Up

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  1. Warm Up 1/8/16 • https://www.youtube.com/watch?v=vJG698U2Mvo

  2. Warm Up 1/8/16 • Why don’t you ever see hippopotamus hiding in trees? • Because they’re good at it.

  3. What time is it when you go to the dentist? Tooth-hurty.

  4. What do you call a big pile of kittens? A meowntain.

  5. Evaluating a Variable ExpressionTo evaluate a variable expression: • substitute the given numbers for each variable. • use order of operations to solve.

  6. What is the value of y if x=3? If x= -3? y= -x If x=3, y = -3 If x= -3, y = 3

  7. What is the value of y if x=3? If x= -3? y= 5-x If x=3, y = 2 If x= -3, y = 8

  8. What is the value of y if x=3? If x= -3? y= 5-2x If x=3, y = -1 If x= -3, y = 11

  9. If x=3, y = 9 If x= -3, y = 9

  10. If x=3, y = -9 If x= -3, y = -9

  11. Answer Now What is the value of 5k3 if k = -4? • -8000 • -320 • -60 • 320

  12. Answer Now What is the value of -10 – 4x if x = -13? • -62 • -42 • 42 • 52

  13. Example # 4 n + (13 - n)  5 for n = 8 = 8 + (13 - 8)  5 (Substitute.) = 8 + 5 5 (parentheses) = 8 + 1 (Divide l/r.) = 9(Add l/r.)

  14. Example # 5 8y - 3x2+ 2n for x = 5, y = 2, n =3 = 8  2- 3  52 + 2  3 (Substitute.) = 8  2 - 3  25 + 2  3 (exponents) = 16- 3  25 + 2  3 (Multiply l/r.) = 16 -75 + 2  3 (Multiply l/r.) = 16 - 75 + 6 (Multiply l/r.) = -59 + 6 (Subtract l/r.) = -53 (Add l/r.)

  15. Answer Now What is the value ofif n = -8, m = 4, and t = 2 ? • 10 • -10 • -6 • 6

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