1. Introducing Simple Algebra2x
2n + 3
3a +2b
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2. I am thinking of a number (which you can call n ), and I double it
I am thinking of a number (which you can call a ), and I treble it 3a
I am thinking of a number (which you can call x ), I double it and then add 3 to it
2x + 3
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3. I am thinking of a number (which you can call k ), I double it and then add 5 to it
I am thinking of a number w, I multiply it by 3 and then subtract 2 from it
3w – 2
I am thinking of a number t, I multiply it by 4 and then add 7 to it
4t + 7
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4. I am thinking of a number v, I multiply it by 4 and then subtract 7 from it
I am thinking of a number d, I multiply it by 7 and then add 6 to it
7d + 6
I am thinking of a number x , I multiply it by 6 and then subtract 5.
6x – 5
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5. I am thinking of a number f, I multiply it by 5 it and then add 9 to it
I am thinking of a number y, I multiply it by 4 and then add 1 to it
4y + 1
I am thinking of a number p , I multiply it by 2 and then subtract 3.
2p – 3
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6. I am thinking of a number a, I multiply it by 2 and then I subtract my answer from 10
I am thinking of a number z, I multiply it by 3 and then I subtract my answer from 17
17 – 3z
I am thinking of a number q, I multiply it by 3 and then I add my answer to 6
6 + 3q
3q + 6
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7. 2a + 2b 3x + 4y I am thinking of a number a and I multiply it by 2.
Then I am thinking of a different number b and I multiply it by 2.
Then I add my two answers together.
2a + 2b
I am thinking of a number x and I multiply it by 3.
Then I am thinking of a different number y and I multiply it by 4.
Then I add my two answers together.
3x + 4y
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8. 2t – 3n 2h – 4g I am thinking of a number t and I multiply it by 2.
Then I am thinking of a different number n and I multiply it by 3.
Then I subtract my 2nd answer from my 1st answer.
2t – 3n
I am thinking of a number g and I multiply it by 4.
Then I am thinking of a different number h and I multiply it by 2.
Then I subtract my 1st answer from my 2nd answer.
2h – 4g
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9. a b = p q = ab ba pq qp x x I am thinking of a number a.
Then I am thinking of a different number b.
Then I multiply my two numbers together. a
b = ab x ba
I am thinking of a number p.
Then I am thinking of a different number q.
Then I multiply my two numbers together. p
q = pq x qp
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10. r s = x y = rs sr xy yx x x I am thinking of a number r.
Then I am thinking of a different number s.
Then I multiply my two numbers together. r
s = rs x sr
I am thinking of a number x.
Then I am thinking of a different number y.
Then I multiply my two numbers together. x
y = xy x yx
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11. I am thinking of a number x and I double it.
Then I am thinking of a different number y.
Then I multiply my two answers together. x 2 x
y =
2xy x
2yx
I am thinking of a number a and I treble it.
Then I am thinking of a different number b.
Then I multiply my two answers together. a 3
3ab
b = x x
3ba
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12. p 2 q 4 = 8pq 8qp x x x I am thinking of a number p and I double it.
Then I am thinking of a different number q and I multiply it by 4.
Then I multiply my two answers together. p 2 q 4
8pq = x x x
8qp
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13. I am thinking of a number m and I multiply it by 5.
Then I am thinking of a different number n and I multiply it by 4.
Then I multiply my two answers together. m 5 n 4 =
20mn x x x
20nm
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14. I am thinking of a number x, and I divide it by 2÷
2 =
I am thinking of a number a, and I divide it by 5 a 5 a ÷
5 =
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15. I am thinking of a number c, and I divide it by 3÷
3 =
I am taking the number 3, and I divide it by a number x 3 x 3 ÷
x =
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16. I am thinking of a number x, and I divide it by another number y÷
y =
I am thinking of a number u, and I divide it by another number v u v u ÷
v =
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17. I am thinking of a number x and I double it.
Then I divide my answer by another number y 2x y x 2 ÷
y = x
I am thinking of a number x and I divide it by 4.
Then I add 7 to my answer x 4 x ÷ 4 +
7 =
+ 7
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18. I am thinking of a number a and I treble it.
Then I divide my answer by 2 3a 2 a 3 ÷
2 = x
I am thinking of a number h and I divide it by 5.
Then I subtract 1 from my answer h 5 h ÷ 5 –
1 =
– 1
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19. © T Madas