FIGURE IT OUT · MATH
The internet still can't agree on 6 ÷ 2(1+2).This is the game that proves whether you actually get it. Four 4s, every operator you know — can you build all 100?
GeoProwl
0 / 100
TARGET #2 / 100
TARGET
2
VALUE
—
Build an expression using four 4s
YOUR EXPRESSION
tap 4 to start…
FOURS0/4
Match the target to share
Download worksheet (PDF)
Progress · tap a number to jump
Operator reference+ − · add and subtract
× ÷ · multiply and divide
^ · power (4^4 = 256)
( ) · grouping for PEMDAS
! · factorial (4! = 24)
√ · square root (√4 = 2)
% · modulo / remainder (44 % 8 = 4)
. · decimal (.4 = 0.4)
Multi-digit: 44 uses two 4s, 444 three.
Goal: every expression must use the digit 4 exactly four times and evaluate to the target.
About this puzzle: The Four Fours problem is a classic recreational-mathematics challenge dating to the late 1800s — deceptively simple, genuinely hard once you're past the easy targets. Most adults stall somewhere in the 20s. It's also a staple of grades 4–8 classrooms because it builds order-of-operations fluency (CCSS 5.OA.A.1 and 6.EE.A.1), mental arithmetic, and creative problem-solving.
Stuck? Read the solutions & strategy guide, or head back to Figure It Out.

How to Play

Pick a target number, using the arrows or the 1–100 map.
Spend exactly four 4s to build an expression — a counter tracks how many you've used.
Match the expression's value to the target, then solve it to share.

Allowed operators: + − × ÷ ^ √ ! % . and parentheses for grouping. For example, 4−4+4−√4 = 2.

About Four Fours

Four 4s, every operator you know — addition, subtraction, multiplication, division, exponents, factorials, square roots, decimals, concatenation — build an expression that equals each target from 1 to 100. It's a classic recreational-math puzzle that doubles as one of the best order-of-operations drills available, since getting the answer wrong almost always traces back to a PEMDAS mistake, not a wrong idea.

Some targets are easy (4 + 4 + 4 + 4 = 16 in a dozen ways); others are notoriously stubborn — if a number is giving you trouble, the solutions guide below has worked answers.

Progress (which targets you've solved, and how) is saved locally in your browser, so you can leave and come back to the same board — no account or sign-up required.

Keep Exploring

Worksheets, solutions, and classroom tips

Order of Operations Game: The Four Fours Challenge (Grades 4–8)

PEMDAS fluency and number sense, with a printable worksheet and differentiation tips.

Four Fours Solutions: How to Make Every Number 1–100

Stuck on a number? Worked solutions for 1–10 and the operators that unlock the rest.