Expressions and Equations

Which is an Expression?

• (7 - 5) + 28

• 5 + 9 = 14

• 30 = 5 x 6

• (3 + 2) + 35 = 40

Which is an equation?

• (6 x 7) + 6

• 4 + 3

• 8 x 5 = 40

• 2 + (6 x 2) - 4

A mathematical expression is:

• The look people have on their face when they find out they have Math today

• The voices and lyrics people use to sing about Math

• A combination of symbols and numbers that represent a quantity

• A combination of numbers and symbols that are equal to each other.

True or False? An equation always has an equal sign.

• False

• True

This picture shows examples of (choose the BEST answer)

• Expressions

• Equations

• Addition

• Math

Which expression shows this sentence?

To find 15 times 72, I multiply 72 by ten and by five, and add the products.

• (15 x 70) + (15 x 2)

• (72 x 10) + (72 x 5)

• (15 x 2) x (72 ÷ 2)

• 15 x 72 = 1080

An equation can show that ____ and ____ are equal.

(choose TWO ANSWERS)

• an expression and a quantity

• 5A and 5B and 5C

• an expression and an expression

• an equation and an equation

Which equation shows this text?

To find 41 times 60, I double and halve.

• 41 x 60 =

  82 x 120

• 41 x 60 = 2460

• 41 x 60 =

  (60 x 40) + (60 x 1)

• 41 x 60 =

  (41 x 2) x (60 ÷ 2)

Which equation shows this text?

To find 34 x 8, I double - double - double.

• 34 x 8 =

  (30 x 8) + (4 x 8)

• 34 x 8 =

  (34 x 2) x 2 x 2

• 34 x 8 = 272

• 34 x 8 =(34 x 2) x 2

When you halve something, you:

• x 4

• x 2

• ÷6

• ÷2