Pre-Algebra · Self-Study
Integers, Rationals
& Algebra Basics
20 carefully designed questions covering the trickiest parts — with instant feedback, worked explanations, and memory tricks.
⚡ Quick Memory Points — Before You Start
SIGN × SIGN
Same → Positive
Different → Negative
Different → Negative
(−3)(−4) = +12
(−3)(+4) = −12
(−3)(+4) = −12
DISTRIBUTE
$a(b+c) = ab + ac$
3(x−5) = 3x − 15
FACTOR OUT
Find the GCF first
6x+9 = 3(2x+3)
SUBTRACT INT
"Keep–Change–Change"
KCC
KCC
5 − (−3) = 5 + 3 = 8
DIVIDE FRAC
Multiply by reciprocal
$\frac{2}{3}÷\frac{4}{5} = \frac{2}{3}×\frac{5}{4}$
ORDER OPS
PEMDAS
Parentheses · Exponents
Mult/Div · Add/Sub
Mult/Div · Add/Sub