Adding 3 Digit Numbers

ROUND to the nearest HUNDRED, then add. 
412 + 606 = 

• 400 + 600 = 1,000
• 412 + 606 = 1,018
• 500 + 600 = 1,100
• 410 + 600 = 1,100

Round to the nearest hundred, then ADD.
150 + 150 = 

• 200 + 200 = 400
• 150 + 150 = 300
• 100 + 100 = 200

Round to the nearest HUNDRED, then ADD.
90 + 80 = 

• 90 + 80 = 170
• 95 + 85 = 180
• 50 + 100 = 150
• 100 + 100 = 200

Round to the nearest HUNDRED, then ADD. 
186 + 109 = 

• 186 + 109 = 295
• 100 + 109 = 209
• 200 + 100 = 300
• 190 + 110 = 200

Round to the nearest TEN, then ADD.
11 + 16 =

• 10 + 20 = 30
• 15 + 15 = 30
• 11 + 10 = 21
• 15 + 10 = 25

Tags

CCSS.2.NBT.B.5

What is the number represented by the place value blocks?

• 305
• 205
• 315
• 300

Tags

CCSS.2.NBT.A.3

What number is represented by the place value blocks? 

• 280
• 200
• 80
• 2,800

Tags

CCSS.2.NBT.A.3

There were 145 donuts at the donut shop. The shop sold 45 of the donuts. How many donuts does the shop have left to sell?

• 45
• 2
• 100
• 145

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Add.
 45
+13
____

• 58
• 888
• 88
• 85

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

Estimate to the nearest hundred to find the SUM. 
202 + 607 = 

• 400
• 800
• 600
• 200