Variable Expressions

Which of the following shows an expression?

• n + 7
• n - 4 = 8
• n
• 7n

Which of the following shows an equation?

• 7t
• t ÷ 7 = 7
• t
• 3t > 15

Which expression below shows:
6 greater than a number (n)

• 6 - n
• n - 6
• 6n
• n + 6

Which expression below shows:
a number (n) split equally into 4 groups

• 4 ÷ n
• n ÷ 4
• 4n
• n + 4

Which expression below shows:
8 less than a number (n)

• 8 - n
• n - 8
• 8n
• n + 8

Which represents the unknown value in the following statement?

s + 3 = 12

• s

• 12

• +

• 3

Which equation represents "a number, x, decreased by 51 is 213?"

• x + 51 = 213

• x - 51 = 213

• x • 51 = 213

• x ÷ 51 = 213

There are 2 fewer students in Mrs. Falls' class than in Mrs. Smith's. If s represents the number of students in Mrs. Smith's class, which of these number sentences could be used to find the number of students in Mrs. Falls' class?

• s - 2 = ?

• s + 2 = ?

• 2 - s = ?

• 2 ÷ s = ?

Bob has 3 times as many stamps as his friend. How might that be expressed if the number of stamps belonging to his friend is represented by s?

• 3 + s

• s ÷ 3

• s - 3

• 3s

Which of these could be solved using the open sentence 56 ÷ 7 = n?

• Makarie has to save $56 to buy a new game. If she saves n dollars a week, how many weeks will she have to save to get the game?

• Devonte collected 56 stamps. If 7 stamps fit on one row of his card, how many rows does he need to store all the stamps?

• Jasiah has a collection of 56 video games. He has 7 times as many toy cars. How many toy cars has he collected?

• Kala has 7 fewer lollipops than Destynea's 56 lollipops. How many lollipops does Kala have?