SaiBook.us Algebra

Home Course Section

Schedule Admission Social

Step-3

Title: Adding signed numbers

Grade: 6-a Lesson: S1-L2

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

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	Addition of integers: \$ 21 + (- 18) + (- 6) + 7 \$
2	Hint	The integers are	\$ 21,- 18,- 6 and 7 \$
3	Formula:	Here we apply the rule of addition of positive and negative integers	\$ (+) + (-) = "use the sign of larger absolute value number" \$
4	Step	Let us add the positive and negative integers	\$ 21 + (- 18) + (- 6) + 7 \$
5	Step	After adding the positive and negative integers	\$+28 - 24\$
6	Step	After simplification	\$ 4 \$
7	Step	Therefore, the addition of integers is \$ 4 \$.
8	Choice.A	This is not correct because it doesn’t accurately represent the sum of the given integers	6
9	Choice.B	This is correct because it accurately represents the sum of the given integers	4
10	Choice.C	This is not correct because it doesn’t accurately represent the sum of the given integers.The sum is 4, not 28	28
11	Choice.D	This is not correct because it doesn’t reflect the correct addition of the given integers	16
12	Answer	Option	B
13	Sumup	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

Addition of integers:
\$ 21 + (- 18) + (- 6) + 7 \$

Hint

The integers are

\$ 21,- 18,- 6 and 7 \$

Formula:

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

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

Step

Let us add the positive and negative integers

\$ 21 + (- 18) + (- 6) + 7 \$

Step

After adding the positive and negative integers

\$+28 - 24\$

Step

After simplification

\$ 4 \$

Step

Therefore, the addition of integers is \$ 4 \$.

Choice.A

This is not correct because it doesn’t accurately represent the sum of the given integers

Choice.B

This is correct because it accurately represents the sum of the given integers

Choice.C

This is not correct because it doesn’t accurately represent the sum of the given integers.The sum is 4, not 28

Choice.D

This is not correct because it doesn’t reflect the correct addition of the given integers

Answer

Option

Sumup

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