Math Fun with Open Sentences for Grade 3

What is an open sentence in mathematics?

• An open sentence is a mathematical equation with no variables.

• An open sentence is a closed statement that cannot change.

• An open sentence is a mathematical statement with variables that can be true or false depending on the values of those variables.

• An open sentence is a statement that is always true.

Solve the open sentence: 5 + _ = 10

• 7

• 5

• 3

• 2

Which of the following is an open sentence? 3x = 12 or 4 + 2 = 6

• x^2 = 16

• 3x = 12

• 5 - 3 = 1

• 2x + 4 = 10

Fill in the blank: 7, __, 11, __, 15 (skip counting by 2s)

• 12

• 10

• 8

• 9, 13

What is the place value of 5 in the number 352?

• 50

• 15

• 500

• 5

Skip count by 5s starting from 10: 10, __, __, __, __

• 12

• 18

• 15, 20, 25, 30

• 22

What is the place value of 8 in the number 584?

• 8

• 800

• 8,000

• 80

Fill in the blank: 2, 4, __, 8, __ (skip counting by 2s)

• 9

• 5

• 6, 10

• 7

Which number is in the tens place in 47?

• 0

• 4

• 3

• 7

Identify the open sentence: 9 + __ = 15

• 7

• 8

• 5

• 6