Year 4 Exam > Year 4 Notes > Year 4 Mathematics > Adding 3-digit and 1-digit numbers together
Adding 3-digit and 1-digit numbers together | Year 4 Mathematics PDF Download
Adding one-digit and three-digit numbers
- Adding a 1-digit number to a 3-digit number follows similar rules as adding a 1-digit number to a 1 or 2-digit number.
- Methods like number lines, partitioning, Base 10, and the column method can all be helpful in this process.
Examples
Example 1: What is 422 + 4?
Sol: Let's use Base 10 this time:
Example 2: What is 285 + 6?
Sol: Let's solve this with a number line. Start on the number 285 and then count on 6.
Notice how both digits in the tens and ones have changed? That’s because you bridged a ten when six was added.
285 + 6 = 291
Another good way to solve the question is to partition the number 6:
Now that 6 has been partitioned into 5 and 1, you can use your number bond knowledge to add the 5 to reach the next ten, then add 1.
First add the 5 to take you to the next ten (290).
285 + 5 = 290
Then add the 1.
290 + 1 = 291
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FAQs on Adding 3-digit and 1-digit numbers together - Year 4 Mathematics
| 1. How can students practice addition by making 10? |  |
Ans. Students can practice addition by making 10 by using manipulatives such as counters or number lines to physically group numbers together to make 10. For example, to add 6 + 7, a student can break 7 into 1 + 6, then combine the 6 with the original 6 to make 10, and finally add the remaining 1 to get the answer 13.
| 2. What is the significance of adding 3-digit and 1-digit numbers together in mathematics? | |
Ans. Adding 3-digit and 1-digit numbers together helps students practice carrying over when the sum of the digits in the units column exceeds 9. This builds a foundational understanding of place value and addition skills that are essential for more complex math concepts.
| 3. How can teachers help students understand the concept of adding 3-digit and 1-digit numbers together? | |
Ans. Teachers can use visual aids such as base-10 blocks or place value charts to demonstrate the process of adding 3-digit and 1-digit numbers together. They can also provide real-world examples and word problems to make the concept more relatable to students.
| 4. What are some common mistakes students make when adding 3-digit and 1-digit numbers together? | |
Ans. Common mistakes students make include forgetting to carry over when the sum in the units column exceeds 9, misaligning the digits when adding vertically, and incorrectly adding the hundreds, tens, and ones places.
| 5. How can parents support their children in practicing addition with 3-digit and 1-digit numbers at home? | |
Ans. Parents can encourage their children to practice addition by making it a fun and interactive activity. They can use everyday objects or games to reinforce the concept, provide praise and encouragement, and create a supportive learning environment.
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Oct 31, 2024 Last updated |
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