Walker 3rd Rounding to nearest 10 NBT 1

What is 28 rounded to the nearest 10?

• 29

• 20

• 30

• 25

what is 84 rounded to the nearest 10?

• 85

• 90

• 80

• 75

What is 138 rounded to the nearest 10?

• 200

• 100

• 140

• 130

What is 261 rounded to the nearest 10?

• 200

• 250

• 260

• 270

I thought I had 40 pencils but I am not sure if I rounded right. So if I have 137 pencils and rounded the ten, what number would I come up with.

If my number sentence is 257 + 222 =____, What is my two new numbers and answer when rounding to nearest 100 to add.