Rounding Numbers in Addition Problems

The video tutorial focuses on simplifying addition problems by rounding numbers to make calculations easier. It demonstrates this technique through several examples, such as 63 + 427, 275 + 595, and 51 + 83, by redistributing values to achieve round numbers. This method helps in performing mental calculations more efficiently.

What is the main purpose of rounding numbers in addition problems?

• To change the value of the expression

• To make the numbers smaller

• To make the calculation easier

• To make the numbers larger

In the example of 63 plus 427, what number do we add to 427 to make it a round number?

• 5

• 4

• 3

• 2

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the result of 60 plus 430?

• 470

• 490

• 500

• 480

In the example of 275 plus 595, what number is added to 595 to make it a round number?

• 7

• 6

• 5

• 4

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the result of 270 plus 600?

• 860

• 890

• 870

• 880

Tags

CCSS.2.NBT.B.7

In the fill-in-the-blank example, what is the new number added to 84?

• 52

• 51

• 53

• 50

Tags

CCSS.1.OA.B.3

Why is it important to take away the same amount from one number if you add to another?

• To make the numbers larger

• To maintain the value of the expression

• To make the numbers smaller

• To change the value of the expression

Tags

CCSS.2.NBT.B.7

In the final example, what is the new number added to 700?

• 138

• 148

• 168

• 158

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the result of 148 plus 700?

• 868

• 878

• 858

• 848

What is the benefit of rounding numbers in addition problems?

• It makes the numbers larger

• It simplifies the calculation

• It makes the numbers smaller

• It changes the value of the expression