Missing Digits
How to Play
Game Instructions
- Each puzzle presents an equation with some digits replaced by underscores (_).
- Your goal is to fill in the blanks to create a valid equation.
- You have 6 guesses to find the correct solution chosen for the day.
- Multiple solutions may exist, but only one is accepted per puzzle.
- Use logic, math skills, and color clues to guide your guesses.
Cognitive Benefits
"Missing Digits" challenges your brain to perform "reverse calculation." Instead of solving 12 + 15 = ?, your brain must ask ? + 15 = 27. This forces you to switch between arithmetic operations (e.g., using subtraction to solve an addition problem), which improves cognitive flexibility.
This puzzle type also strengthens "estimation" skills. By quickly assessing the magnitude of the visible numbers, you train your brain to filter out impossible answers before you even do the precise math, a skill highly transferable to real-world financial decision making.
Tips for Success
- Start by filling in the most obvious blanks first.
- Check if your completed equation is mathematically correct before submitting.
- Use color clues to eliminate impossible digits for each position.
- Try different combinations and use process of elimination.
- Remember: only one solution is accepted, so think carefully!
Expert Strategies
The "Ones Digit" Rule
Always calculate the last digit (the ones place) first. If you have _4 × _3 = __2, you know the
answer must end in 2 because 4×3=12. This simple check can instantly rule out
90% of
incorrect guesses.
Magnitude Estimation
Look at the number of digits in the answer. If you are multiplying a 2-digit number by a 1-digit number and the result is over 500, your 1-digit number must be quite large (likely 6, 7, 8, or 9).
Division Remainder Check
For division puzzles like _5 ÷ 5 = _, remember
divisibility rules. A number ending in 5 divided by 5 will always result in an
odd
number or a decimal (decimals aren't used here). Use these properties to narrow
your
search.
Puzzle Origins
This game is a digital evolution of "cryptarithms" or "alphametics," a genre of mathematical puzzles where digits are replaced by letters or symbols. The most famous example is the 1924 classic "SEND + MORE = MONEY." In education, this format is known as the "Cloze method," used to test a student's comprehension of mathematical structure rather than just rote memorization.
Example Puzzles
- Easy:
1_+2_=35(Fill in the blanks: 12+23=35) - Medium:
_4×_5=__0(Fill in the blanks: 34×25=850) - Hard:
___-__=78(Fill in the blanks: 123-45=78) - Expert:
9_÷1_=08(Fill in the blanks: 96÷12=08)