LGCSE Q&A

BODMAS rule
The brackets have to be solved first followed by powers or roots, then Division, Multiplication, Addition, and at the end Subtraction.

Balancing chemical equations:

Start with the element that occurs only once on each side of the equation and balance it first.

reactions involve the transfer of electrons.

-oxidation is loss (of electrons)
-reduction is gain (of electrons).

Memorizing Pi
To remember the first seven digits of pi, count the number of letters in each word of the sentence:
"How I wish I could calculate pi."
This becomes 3.141592. 😎

Finding the slope of a line: The slope of a line is a measure of how steep the line is. It is defined as the change in y divided by the change in x between two points on the line. The formula for slope is (y2 - y1) ÷ (x2 - x1), where (x1, y1) and (x2, y2) are two points on the line. For example, to find the slope of the line that passes through the points (1, 2) and (4, 5), you can use the formula to get (5 - 2) ÷ (4 - 1) = 1

TIPS:

Multiplying by 11: To multiply any number by 11, simply write down the original number, and then add the sum of the digits of the original number between each digit. For example, to multiply 35 by 11, write down 35 and then add 3 + 5 to get the answer, which is 385. 😎

TIPS:
Multiplying by 9: To multiply any number by 9, simply multiply the number by 10 and then subtract the original number. For example, to multiply 6 by 9, first multiply 6 by 10 (60), and then subtract 6 from 60 to get the answer, which is 54.😎

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