3-Number Column Addition: Make 10 First, Fix Errors Worksheet
Free maths practice for home or the classroom. Print this 3-Number Column Addition: Make 10 First, Fix Errors Worksheet and its answer key on A4 paper, one page each.
Use New Numbers to make another set. Choose Worksheet or Answer Key, then use the worksheet’s Print button.
Teaching Notes
Focus: Adding Three Numbers: Make 10 First. Use the worked example and teaching sequence below to explain the reasoning before independent practice.
Before You Begin
- Know pairs that make 10.
Teaching Steps for Parents and Teachers
- For an error-correction problem, find the first incorrect step. Explain why it is wrong, then recompute all later steps.
- Find how many more are needed to make 10.
- Split the other addend into that amount and the remaining amount.
- Add to 10, then add what remains.
Worked Examples
8 + 5 = □
- 8 needs 2 to make 10.
- Split 5 into 2 + 3.
- 8 + 2 + 3 = 10 + 3 = 13.
Answer: 13
Common Mistakes and How to Help
After making 10, add only the remaining part.
Do the two parts still add to the original addend?
Questions to Check Understanding
- Do the two parts still add to the original addend?
- Which step explains your answer?
- Can you apply the same reasoning when the numbers change?
Practice Advice
Work through the example together. Ask the learner to explain the first two problems, then try three independently. Review the first incorrect step before assigning more practice.
Next Practice
- Use New Numbers to practice the same skill with different values.
- If the learner needs help, return to the example and model each step before trying again.