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1. Grade 7 – Mathematics
Quarter II
EVALUATING ALGEBRAIC
EXPRESSIONS

2. Prepared by:
Jo-Ann E. Rogon

3. (-2) (-2) =
(-2) (-3) =
(4) (-2) =
(-3) (-4) =
(4) (5) =
(-7) (-2) =
(-8) (-9) =
(-9) (2) =
(-4) (-4) =
4
6
-8
12
20
14
72
-18
16
Activity 1: SHOW ME BOARD.Multiply the following integers and state the rules in multiplying signed numbers.

4. Activity 2:
Let sing Bahay-Kubo by changing all the vowels with a, e, i, o, u

5. Example 1
If x = 2,
find 3x + 3.
3(2) + 3
6 + 3 = 9
Example 2
If m = -4,
find 3m + 6.
3(-4) + 6
-12 + 6 = -6
Example 3
If a = 2, find
a3 + 4.
(2)3 + 4
8 + 4 = 12
Conclusion
In evaluating algebraic expression,
first step is to ____________ , next is
___________, then _________…
My Own Example

6. Conclusion
In evaluating algebraic expressions
using algebra tiles, replace the x-tile
with _____________ then proceed to
____________.
My Own Example

7. GIVEN: If x = 2, evaluate 2x + 3
By Substitution: 2x + 3
= 2 (2) + 3
= 4 + 3
= 7

8. GIVEN: If x = -2, evaluate 2x + 3
By Substitution: 2x + 3
= 2 (-2) + 3
= -4 + 3
= -1

9. GIVEN: If x = 2, evaluate 2x + 3
By Algebra Tiles 2x + 3
x x
x
Step 1
2x
+
3
Step 2 x= 2
Step 3 4
+
3
= 7
+ 3
ANSWER
x

10. GIVEN: If x = -2, evaluate 2x + 3
By Algebra Tiles 2x + 3
x x
x
Step 1
2x
+
3
Step 2 x= -2
Step 3 -4
+
3
= -1
+ 3
ANSWER
x

11. EVALUATING ALGEBRAIC EXPRESSIONS
- is the process of substitution or
replacement of the variables in a given
algebraic expressions with a given
number found in a given replacement set
and simplifying its result.

12. Fill in the missing lyrics of the song “Bahay Kubo” by completing
the table below. Each vegetable has its corresponding answer
which may help you in completing the song.
Activity 3:
Bahay-kubo, kahit munti
Ang 375 doon ay sari-sari
11 at talong
17 at mani
Sitaw, 12, patani
100, patola, 19 't kalabasa
At tsaka mayro'n pang
81, 22
Sibuyas, 36, bawang at luya
Sa paligid-ay puno ng 25.
Given Replace variable
with 3
Replace variable
with 5
3a + 2 singkamas sigarilyas
5a – 3 bataw mustasa
10 + 3b upo linga
4x2 kamatis kundol
3y3 labanos Halaman

13. Evaluate. Replace n with 2 and x with 5.
1. 5n 6. 5(n+2)
2. xn 7. 2(x+4)
3. 4 (x-3) 8. 3(n+4)
4. n(4+1) 9. 3(n+x)
5. 4x 10. x(5-3)