November 4, 2022
Basic Skills
- Negative Numbers
- same signs = +ve
- different signs = -ve
- Add and Subtract Fractions
- Common denomenator
- Multiply and Divide Fractions in IGCSE Maths
- Multiplying: x tops, x bottoms
- Dividing: flip 2nd fraction then x
- Basic %
- Fraction x100
- Fraction/ Decimal/ %
- x or / by 100
Number
- Prime Factorisation
- factor tree
- In IGCSE Maths, you can find HCF and LCM by
- factor tree, venn diagram
- Venn diagram:
- put no.s there are in common in centre
- fill in rest of circles with other no.s
- HCF: intersection no.s x together
- LCM: all no.s in diagram x together
- Recurring Decimals
- answers is always '/9' or '/99' or '999' etc
- Rounding
- more than 5- round up
- less than 5- round down
- Reverse %
- divide amount given by 100- given %
- TV reduced by 15% in sale now £100- original amount: 100/(100- 15)
End of this topic!
Drafted by Gina (Mathematics)