What in the World Went Wrong???

Mrs. G added 827 + 92.

She wrote down 800 + 20 + 7 and 9 + 2

What in the World Went Wrong???

• She didn't do anything wrong

• She should have written 90 + 2 instead of 9 + 2

• She should have written 800+20+7 and 90+2

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Mrs. Lambert said that 1,049 + 149 = 1,098

What in the World Went Wrong???

• She forgot to add the 100 from "149"

• She didn't do anything wrong.

• 1,049 > 149

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Mrs. Byrd says that you cannot add break apart 1,003 + 78 because there aren't any 100s and 10s in 1,003.

What in the World Went Wrong???

• I'm not sure what went wrong because I think she's right.

• There aren't any 100s and 10s in 1,003, but you can still break it apart as 100 + 3

• 1,003 is 1000 + 3. You can break it apart. She needs to go back to the Teacher Table.

Tags

CCSS.2.NBT.B.7

Mrs. Burkhart says the break apart method is so EASY!

She solved the equation

999 + 909 =

900 + 90 + 9 + 99

What in the World Went Wrong???

• It looks GREAT to me! Nothing went wrong.

• It should have been 900 + 90 + 9 + 900 + 9

• It should have been 900 + 90 + 9 + 90 + 9

Mrs. Hanson had to double 138. She broke it apart as:

100 + 30 + 8

What in the World Went Wrong?

• She should have broken it apart as 130 + 8 and 130 + 8

• She should have broken it apart as 100 + 3 + 8

• She should have broken it apart as 100 + 38 and 100 + 38

• She should have broken it apart as 100 + 30 + 8 and 100 + 30 + 8

Tags

CCSS.5.NBT.B.5

Mrs. Talbert is confused. She thought she should break apart 1,578 as 1,000 + 500 + 80 + 7

What in the World Went Wrong???

• She switched the 8 and 7. It should have been

  1,000 + 500 + 70 + 8

• It should have been 1,000 + 50 + 7 + 8

• It should have been 100 + 50 + 70 + 8

Tags

CCSS.4.NBT.A.2