Interactive quiz: Find the unknown in Grade 3 basic equations

📚 Quick Study Guide

• ➕ Addition: Combining numbers to find their sum. For example, $3 + 5 = 8$.
• ➖ Subtraction: Finding the difference between two numbers. For example, $10 - 4 = 6$.
• ✖️ Multiplication: Repeated addition. For example, $2 \times 6 = 12$ (which is the same as $2+2+2+2+2+2$).
• ➗ Division: Splitting a number into equal groups. For example, $15 \div 3 = 5$ (15 split into 3 groups is 5 in each group).
• 🧮 Unknowns: The missing number in an equation, often represented by a box, a question mark, or a letter like 'x'. Our goal is to find what number makes the equation true!
• 💡 Solving Equations: Use inverse operations (opposite operations) to isolate the unknown. For example, in $x + 2 = 5$, subtract 2 from both sides to find $x$.
• 📝 Important Note: Always check your answer by plugging it back into the original equation!

➕ Practice Quiz

1. What number goes in the box to make this equation true? ☐ + 5 = 12
   1. 3
   2. 6
   3. 7
   4. 17
2. 15 - ☐ = 8. What number is missing?
   1. 23
   2. 7
   3. 8
   4. 10
3. Solve for x: 3 \times x = 21
   1. 63
   2. 7
   3. 18
   4. 24
4. What number, when divided by 4, equals 3? ☐ \div 4 = 3
   1. 1
   2. 7
   3. 12
   4. 16
5. If 7 + y = 19, what is the value of y?
   1. 12
   2. 26
   3. 11
   4. 10
6. Find the unknown: 25 - a = 11
   1. 36
   2. 14
   3. 16
   4. 18
7. What value of 'b' makes the equation b \times 5 = 30 true?
   1. 5
   2. 6
   3. 25
   4. 35