Fact Family House
Given 3 related numbers (e.g., 3, 4, 7), fill in the missing number in all 4 addition and subtraction sentences. A house-shaped visual shows the family numbers on the roof with equations inside.
How to Play Fact Family House
- 1
Choose Difficulty and Mode
Pick Easy (numbers to 10), Medium (to 20), or Hard (to 50). Then select 60-Second Rush or Survival (3 lives).
- 2
Look at the Roof Numbers
Three numbers appear on the house roof — for example 3, 4, 7. These form a fact family: 3+4=7, 4+3=7, 7−3=4, 7−4=3.
- 3
Fill the Blank
One number in the current sentence is replaced by a pulsing blank. Choose the correct value from four colorful buttons. Complete all 4 sentences to finish the family.
- 4
Complete Families
Once all 4 sentences are filled correctly, a new family appears. Keep going to build your score and streak!
Key Features
House-Shaped Visual Display
The three family numbers appear on a warm gradient roof, with the four related addition and subtraction sentences displayed inside the house. The current sentence highlights, completed ones show a green checkmark.
Three Difficulty Levels
Easy uses numbers up to 10 with the result always blank. Medium extends to 20 and can blank any position. Hard goes to 50 with varied blank positions — requiring flexible thinking about inverse operations.
60-Second Rush and Survival Modes
In Rush mode, complete as many full fact families as possible before time runs out. In Survival mode you have 3 lives — every wrong answer costs one.
Four Colorful Multiple-Choice Buttons
Orange, sky, rose, and emerald buttons make answering quick. Keyboard shortcuts 1–4 speed up desktop play. Streak counter rewards consecutive correct answers.
What is Fact Family House?
Fact Family House is a math game that teaches the relationship between addition and subtraction through fact families. A fact family is a set of three numbers that are related by addition and subtraction — for example, 3, 5, and 8 produce four facts: 3+5=8, 5+3=8, 8−3=5, 8−5=3. The game displays the three family numbers on a colorful house roof, with the four equations listed inside. One number in each equation is blanked out and the player must identify it from multiple-choice options. This structure helps students see that addition and subtraction are inverse operations — if you know one fact, you automatically know three others.
Why Play Fact Family House?
- 1
Connects Addition and Subtraction
Many children learn addition and subtraction as separate skills. Fact families reveal they are two sides of the same coin — knowing 4+5=9 immediately gives you 9−5=4 and 9−4=5.
- 2
Builds Algebraic Thinking
Finding the missing number in different positions (first addend, second addend, or sum) is the same skill needed for solving equations later. Early exposure builds confidence with unknowns.
- 3
Reinforces Commutativity
Seeing both a+b=c and b+a=c in every family reinforces that addition order doesn't matter — a core property students need to internalize for flexible mental math.
- 4
Visual House Metaphor
The house with numbers on the roof is a classic classroom tool used worldwide. Playing with the same visual digitally reinforces what students learn at school.
Frequently Asked Questions
What is a fact family?
A fact family is a group of 3 numbers that are connected through addition and subtraction. For example, 2, 6, 8 form a family because 2+6=8, 6+2=8, 8−2=6, and 8−6=2. Every fact family produces exactly 4 related equations.
Which number can be blank?
On Easy difficulty, the sum/difference (result) is always blank. On Medium and Hard, any of the three positions can be blank — the first number, second number, or result — making the game progressively more challenging.
How many sentences are in each family?
Every fact family has 4 sentences: two addition (a+b=c, b+a=c) and two subtraction (c−a=b, c−b=a). You must complete all 4 to finish a family and get a new one.
Can I use keyboard shortcuts?
Yes! Press 1, 2, 3, or 4 to select the corresponding colored button. This lets desktop players answer quickly without reaching for the mouse.
Are scores saved?
Yes. Your best score is saved locally in your browser for each combination of difficulty and game mode. It's shown on the settings screen so you always know what to beat.