Introduction & Checkpoint Algebra!
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Algebra is great fun - You get to solve puzzles!
A Puzzle…
What is the missing number?
- 2 = 4 Ok, the answer is 6, right? Because 6 - 2 = 4
Well, in algebra we don’t use blank boxes, we use a letter (usually an x or y, but any letter is fine). So we write
x - 2 = 4
It is really that simple. The letter ‘x’ just means “we don’t know this yet”, and is often called the unknown, or the variable.
And when we solve it, we write x = 6
Introduction to Algebra - Multiplication!
What’s the missing number?
x 4 = 8 The answer is 2, right? Because 2 x 4 = 8.
But because we don’t use blank boxes, we use a letter. So we might write:
x x 4 = 8
But the ‘x’ looks like the multiply ‘x’ and that can be very confusing. So in algebra, we don’t use the multiply symbol (x) between numbers and letters.
We put the number next to the letter to mean multiply: 4x = 8
Watch this video!
Now have a go! Click on the right link for your group
Keep Practicing!
Using symbols instead of numbers
Try these:
6 + a = 19
b + 43 = 60
15 – c = 2 Be careful with these ones
d – 26 = 90
e x 4 = 32
7 x f = 77
g ÷ 10 = 120
300 ÷ h = 6
Using symbols instead of numbers
Try these:
6 + a = 19 a = +13
b + 43 = 60 b = +17
15 – c = 2 c = -12
d – 26 = 90 d = 116
e x 4 = 32 e =
7 x f = 77 f =
g ÷ 10 = 120 g =
300 ÷ h = 6 h =
Using symbols instead of numbers
Try these:
6 + a = 19 a = 19 - 6
b + 43 = 60 b = 60 – 43
15 – c = 2 c = 15 - 2
d – 26 = 90 d = 90 + 26
e x 4 = 32 e = 32 ÷ 4
7 x f = 77 f = 77 ÷ 7
g ÷ 10 = 120 g = 120 x 10
300 ÷ h = 6 h = 300 ÷ 6
Using symbols instead of numbers
Try these:
6 + a = 19 a =
b + 43 = 60 b =
15 – c = 2 c =
d – 26 = 90 d =
e x 4 = 32 e =
7 x f = 77 f =
g ÷ 10 = 120 g =
300 ÷ h = 6 h =
Use BEDMAS to guide you through the following
Try these:
(6 + a) - 7 = 19 a =
(b + 43) - 12 = 60 b =
(15 x c) - 28 = 2 c =
(d – 26) x 3 = 90 d =
(e x 4) + 4 = 32 e =
(7 x f) + 7 = 77 f =
(g ÷ 10) x 12 = 120 g =
300 ÷ h = 6 h =