Lesson 4: Practice Buddy: Independent Practice

Use mental math strategies to solve.

6100 - 822

Tags

CCSS.4.NBT.B.4

Use mental math strategies to solve.

9400 + 2190

Tags

CCSS.4.NBT.B.4

Use mental math strategies to solve.

4745 - 1660

Tags

CCSS.4.NBT.B.4

Use mental math strategies to solve.

385700 + 65300

Tags

CCSS.2.NBT.B.7

Use mental math strategies to solve.

1000 + 4931

Tags

CCSS.4.NBT.B.4

Use mental math strategies to solve.

9485 - 2485

Tags

CCSS.4.NBT.B.4

Use the table to answer 14-15

Which state has the greatest land area in square miles. Use number names to write the area.

Tags

CCSS.5.NBT.A.3

CCSS.5.NBT.B.7

The town of Jasper Falls collected 7322 spirals and 21184 pencils for a school supplies drive. The goal is 30000 total spirals and pencils. Show how to use counting on to find how many more spirals and pencils are needed to reach the goal.

Tags

CCSS.4.OA.A.3

Is 74800 - 24628 greater than or less than 50k+? Explain how you can tell using mental math.

Tags

CCSS.4.NBT.B.4

Guy uses compensation to add 5779 + 2399. His answer is 8180. Is Guy's answer correct? What mistake may he have made?

• No, his answer is not correct. He subtracted 1 from 2399 to get 2400. He should have added 1 to his sum instead of subtracting it. The answer is 8179.

• No, his answer is not correct. He added 1 to 2399 to get 2400. He should have subtracted 1 instead of adding it. The answer should be 8178.

• No, his answer is not correct. He added 1 to 2399 to get 2400. He should have added 1 to his sum instead of subtracting it. The answer should be 8178.

• Yes, his answer is correct

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2