GRE Quant · Chapter Test
Divisibility, Factors & Multiples — 25-Question Test
A fresh, mixed-difficulty set drawn from the whole chapter — questions you haven't been asked before. Auto-graded with full solutions; your result is saved to your dashboard.
Building your 25-question test…
Formula Reference Sheet
This chapter
Divisibility tests
| By 2 | last digit even |
|---|---|
| By 3 | digit sum divisible by 3 |
| By 4 | last two digits divisible by 4 |
| By 5 | ends in 0 or 5 |
| By 9 | digit sum divisible by 9 |
GCD & LCM
| GCD × LCM | GCD(a,b) × LCM(a,b) = a × b |
|---|---|
| LCM from GCD | LCM = (a × b) / GCD |
| Coprime numbers | GCD = 1 ⇒ LCM = a × b |
| Divisibility by 6 | divisible by 2 AND by 3 |
GRE reference
🖩 Graphing Calculator