4.5A Modeling Addition and Subtraction

A school needs to buy 450 new notebooks. They already have 115 red notebooks and 205 yellow notebooks. The rest will be blue. Which equation can be used to find b, the number of blue notebooks the school should buy?

• b = 450 - 115 + 205

• b = 450 + 115 + 205

• b = 450 - 115 - 205

• b = 115 + 205

Tags

CCSS.3.OA.D.8

What is the number sentence that goes with this strip diagram?

• 137 - 349 = x

• 137 + 349 = x

• 349 - 137 = x

• 349 + 137 = x

Tags

CCSS.2.NBT.B.7

What is the number sentence that goes with this strip diagram?

• 358 - 74 = x

• 358 + 74 = x

• 74 - 358 = x

Tags

CCSS.2.NBT.B.7

What is the number sentence that goes with this strip diagram?

• 36 + 27 = 58

• 58 - 36 + 27 = x

• 36 + 27 + 58 = x

• 58 - 36 - 27 = x

Tags

CCSS.1.OA.D.8

What equation matches the strip diagram?

Hint: Two possible answers

• 874 - 301 - 521 = W

• 874 - 301 + 521 = W

• 301 + 521 = 822

  874 - 822 = W

• 310 x 3 = W

Tags

CCSS.4.NBT.B.5

The perimeter of a triangle is 1,047 centimeters. Side 1 is 451 centimeters. Side 2 is 321 centimeters. Which equation can be used to find s, the length of Side 3?

• s = 1,047 - 451 + 321

• s = 451 +321

• s = 1,047 + 451 + 321

• s = 1,047 - 451 - 321

Tags

CCSS.3.MD.D.8

What is the best estimate for 1,283 + 6,750?

• 8,000

• 7,000

• 9,000

• 8,033

What is the best estimate for 981 - 864

• 0

• 100

• 117

• 150

Which expression has the exact same difference as 20 - 6?

• 21 - 5

• 20 - 5

• 19 - 5

• 19 - 6

Tags

CCSS.5.OA.A.1

CCSS.5.OA.A.2

Which expression has the exact same difference as 200 - 64?

• 200 - 60

• 199 - 63

• 201 - 63

• 200 - 63