Adding and Subtracting Decimals

The video tutorial covers adding and subtracting rational decimals, starting with a review of integer operations. It explains how to add decimals with the same and different signs, using examples to illustrate the concepts. The tutorial also demonstrates how to handle subtraction by converting it to addition, using the 'keep change change' method. Practical examples, such as calculating bank balances, are used to reinforce learning. The video concludes with practice problems to solidify understanding.

If the temperature at 7 PM is -5 degrees and it drops by 10 degrees by midnight, what is the temperature at midnight?

• -5 degrees

• -10 degrees

• 0 degrees

• -15 degrees

Tags

CCSS.7.NS.A.3

When adding two positive decimal numbers, what should you do with the sign?

• Ignore the sign

• Change the sign to zero

• Change the sign to negative

• Keep the positive sign

Tags

CCSS.7.NS.A.1C

What is the result of adding -5.0 and -10.0?

• 5.0

• -15.0

• -5.0

• 15.0

Tags

CCSS.7.NS.A.1C

If your bank account balance is -$20.50 and you deposit $15.75, what is your new balance?

• $4.75

• $5.25

• -$5.25

• -$4.75

Tags

CCSS.7.NS.A.1C

When adding a positive and a negative decimal, what should you do?

• Add the values and keep the positive sign

• Subtract the values and keep the sign of the smaller absolute value

• Subtract the values and keep the sign of the larger absolute value

• Add the values and keep the negative sign

Tags

CCSS.7.NS.A.1C

What is the result of adding 0.65 and -2.75?

• 2.75

• -2.10

• -2.75

• 2.10

Tags

CCSS.7.NS.A.1C

How do you find the difference between two decimal values with different signs?

• Subtract the values and keep the sign of the smaller absolute value

• Add the values and keep the negative sign

• Add the values and keep the positive sign

• Subtract the values and keep the sign of the larger absolute value

Tags

CCSS.7.NS.A.1C

What is the first step in converting a subtraction problem to an addition problem?

• Change the second number to its opposite

• Change the subtraction sign to addition

• Change both numbers to their opposites

• Change the first number to its opposite

Tags

CCSS.7.NS.A.1C

What is the result of converting -7.49 - (-0.9) to an addition problem?

• 7.49 - 0.9

• 7.49 + 0.9

• -7.49 + (-0.9)

• -7.49 + 0.9

Tags

CCSS.7.NS.A.1C

What is the result of converting 14.8 - 7.8 to an addition problem?

• -14.8 + 7.8

• 14.8 + (-7.8)

• -14.8 + (-7.8)

• 14.8 + 7.8

Tags

CCSS.7.NS.A.1C