EXAMPLE 01A parent walkthrough
47 + 38 = ?
Show them: Add ones: 7 + 8 = 15, write 5 carry 1
Say: Add tens: 4 + 3 + 1 = 8
Say: Answer 85
FINAL ANSWER
85
MATH LEVEL B
Vertical Addition & Subtraction — Level B Parent Guide
Last updated:
Vertical column addition and subtraction with carrying and borrowing, up to 3-digit numbers.
Grades 2-3 · approximate gradeTHE DEFINITION
What is Kumon Math Level B?
Kumon Math Level B (Vertical Addition & Subtraction) is the 7th of 21 levels in the Kumon math program, where children learn vertical column addition and subtraction with carrying and borrowing, up to 3-digit numbers. It typically aligns with grades 2-3 schoolwork, though Kumon places children by ability rather than age, so the grade is a guide, not a rule.
Level B builds directly on Math Level A: Horizontal Addition & Subtraction and prepares children for Math Level C: Multiplication. It is one of 21 Kumon math levels covered in this independent parent guide series.
This is an independent parent guide, not an official curriculum or placement assessment. Topics and pace can vary; your child’s instructor can confirm their current work.
- Carry in addition (47 + 38)
- Borrow in subtraction (62 - 45)
- 3-digit column calculations
- Neat column alignment
- Check answers with the inverse operation
How do I help my child with Level B?
Work through one example together, then let your child try the next one alone. A few small problems to try together — let your child attempt each first, then use these prompts when they need a nudge.
Original examples in Kumon style, written for parents — not scanned worksheets.
EXAMPLE 02A parent walkthrough
62 - 45 = ?
Show them: Ones: 2 - 5 won't work, borrow: 12 - 5 = 7
Say: Tens: 5 - 4 = 1
Say: Answer 17
FINAL ANSWER
17
How can parents support Level B?
Short, calm, and daily beats long and pressured. These small habits make Level B stick — pick one and start tonight.
Neat columns prevent 80% of errors — use graph paper
Teach checking: 17 + 45 should give 62
Borrowing is the #1 struggle; be patient here
A LITTLE MORE CLARITY