Composing and decomposing numbers examples for Grade 1

📚 Quick Study Guide

• 🍎 Composing numbers means putting numbers together to make a bigger number. Think of it like adding!
• 🧩 Decomposing numbers means taking a number apart into smaller numbers. Think of it like subtraction or breaking it down!
• 🔢 Every number can be composed and decomposed in many different ways. For example, 5 can be 2 + 3, or 1 + 4, or even 5 + 0!
• 💡 Use objects like counters, blocks, or even your fingers to help you see how numbers can be combined or separated.
• ➕ The plus sign (+) means to add or compose.
• ➖ The minus sign (-) means to subtract or decompose.

📝 Practice Quiz

1. What two numbers make 4 when composed?
   1. 1 + 2
   2. 2 + 2
   3. 1 + 4
2. Which of these shows how to decompose the number 6?
   1. 2 + 3
   2. 7 - 1
   3. 3 + 3
3. If you compose 3 and 1, what number do you get?
   1. 2
   2. 3
   3. 4
4. What is 5 decomposed into 2 and what other number?
   1. 1
   2. 3
   3. 7
5. Which equation shows a way to compose 7?
   1. 1 + 5
   2. 2 + 4
   3. 3 + 4
6. Decompose 8 into two equal numbers. What are they?
   1. 2 and 6
   2. 3 and 5
   3. 4 and 4
7. Which of the following is NOT a way to decompose 9?
   1. 4 + 5
   2. 6 + 3
   3. 2 + 6