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Title: Subtracting signed numbers

Grade: 6-b Lesson: S1-L3

Explanation: Hello Students, time to practice and review the steps for the problem.

Discussion: Step1 Step2 Step3 Step4 Step5

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	Subtraction of integers: \$ (- 10) - ( - 15 ) \$
2	Hint	The two integers are	\$ - 10 , - 15 \$
3	Step	Subtraction problem turns into an addition problem	\$ (- 10) + 15 \$
4	Formula:	Here we apply the rule of addition of negative and positive integers	\$ (-) + (+) = "use the sign of larger absolute value number" \$
5	Step	Let us subract both the integers	\$ - 10 + 15 \$
6	Step	After subraction we get	\$ 5 \$
7	Step	Therefore, the subtraction of integers is \$ 5 \$.
8	Choice.A	Subtracting - 15 is equivalent to adding 15. Therefore, this option is not correct	-25
9	Choice.B	This is not the correct answer either because (- 10) + 15 equals 5, not - 5	-5
10	Choice.C	This is not the correct answer. We’re performing subtraction, not finding the absolute difference. (-10) + 15 equals 5, not 25	25
11	Choice.D	This is the correct answer. As mentioned earlier, (-10) - (-15) becomes (-10) + 15, which equals 5	5
12	Answer	Option	D
13	Sumup	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

Subtraction of integers:
\$ (- 10) - ( - 15 ) \$

Hint

The two integers are

\$ - 10 , - 15 \$

Step

Subtraction problem turns into an addition problem

\$ (- 10) + 15 \$

Formula:

Here we apply the rule of addition of negative and positive integers

\$ (-) + (+) = "use the sign of larger absolute value number" \$

Step

Let us subract both the integers

\$ - 10 + 15 \$

Step

After subraction we get

\$ 5 \$

Step

Therefore, the subtraction of integers is \$ 5 \$.

Choice.A

Subtracting - 15 is equivalent to adding 15. Therefore, this option is not correct

-25

Choice.B

This is not the correct answer either because (- 10) + 15 equals 5, not - 5

-5

Choice.C

This is not the correct answer. We’re performing subtraction, not finding the absolute difference. (-10) + 15 equals 5, not 25

Choice.D

This is the correct answer. As mentioned earlier, (-10) - (-15) becomes (-10) + 15, which equals 5

Answer

Option

Sumup

Can you summarize what you’ve understood in the above steps?

Discussion: Step1 Step2 Step3 Step4 Step5