Real-world examples: Solving for unknowns in multiplication (Grade 4)

📚 Quick Study Guide

• 🍎 Multiplication is repeated addition. For example, $3 \times 4$ means adding 3 four times (3 + 3 + 3 + 3).
• 🔢 When you don't know one of the numbers, you can use what you *do* know to find it. This is like solving a puzzle!
• 🧮 The unknown number is often represented by a question mark (?) or a letter like 'n'.
• 💡To find the unknown, think about the relationship between multiplication and division. If $a \times b = c$, then $c \div a = b$ and $c \div b = a$.
• 📝 Real-world problems often give clues that help you set up the multiplication equation. Look for keywords like 'each,' 'per,' 'in total,' and 'groups'.

🧪 Practice Quiz

1. Sarah bought 5 boxes of crayons. Each box had the same number of crayons. If Sarah has a total of 30 crayons, how many crayons are in each box?

   1. 5
   2. 6
   3. 25
   4. 35

2. A farmer plants 8 rows of corn. Each row has the same number of corn plants. If the farmer planted 72 corn plants in total, how many corn plants are in each row?

   1. 7
   2. 8
   3. 9
   4. 10

3. Michael reads 6 pages of his book every day. After a certain number of days, he has read 42 pages. How many days has Michael been reading?

   1. 6
   2. 7
   3. 8
   4. 9

4. A bakery sells muffins in packs. Each pack contains the same number of muffins. If they sold 9 packs and have sold 54 muffins in total, how many muffins are in each pack?

   1. 5
   2. 6
   3. 7
   4. 8

5. John saves $7 each week. After a certain number of weeks, he saved $63. How many weeks did he save?

   1. 7
   2. 8
   3. 9
   4. 10

6. A school has 4 classrooms. Each classroom has the same number of students. If the school has a total of 96 students, how many students are in each classroom?

   1. 22
   2. 23
   3. 24
   4. 25

7. A store sells cookies in boxes. Each box contains the same number of cookies. If they sold 7 boxes and have sold 49 cookies in total, how many cookies are in each box?

   1. 5
   2. 6
   3. 7
   4. 8