Go through the **Spectrum Math Grade 2 Answer Key Chapter 6 Lesson 6.21 Adding and Subtracting on a Number Line **and get the proper assistance needed during your homework.

## Spectrum Math Grade 2 Chapter 6 Lesson 6.21 Adding and Subtracting on a Number Line Answers Key

**Use the number line to add.**

**Use each number line to add or subtract.**

Answer:

Subtraction means moving backwards or moving to the left.

The bigger number is 50 and the smaller number of 20.

Here each point equals to 10.

To subtract 20 from 50, move 2 steps backward from 50.

Thus, the difference of 50 and 20 is 30.

Answer:

Addition means moving forward or moving to the right.

The bigger number is 20, so start from 20 and move 15 times towards the right or in forward direction.

Thus, the sum will be 35.

Thus, the sum of 20 and 15 is 35.

Answer:

Subtraction means moving backwards or moving to the left.

The bigger number is 90 and the smaller number of 25.

To subtract 25 from 90, move 25 points backward from 50.

Thus, the difference of 90 and 25 will be 65.

Answer:

Addition means moving forward or moving to the right.

The bigger number is 60, so start from 60 and move 13 times towards the right or in forward direction.

Thus, the sum will be 73.

Thus, the sum of 60 and 13 will be 73.