Add and subtract multi-digit numbers with regrouping.
Big Addition and Subtraction teaches fourth graders the standard method: line up the places, work from right to left and regroup when needed. Kids also check their answers by estimating, an important habit for accurate math.
Math course · Grade 4
Big Addition and Subtraction · Learning goals
Line up the places, add or subtract from right to left, and regroup when you need to. Check answers by estimating.
Why it matters
Adding and subtracting multi-digit numbers fluently is a key grade 4 goal in most curricula.
Checking with an estimate catches mistakes and builds independence: kids learn to trust their own work.
Budgets, distances and scores in the thousands all need accurate addition and subtraction.
Inside Big Addition and Subtraction
A short read-aloud lesson first, then hands-on games and a quiz to lock it in.
Step 1 · Lesson
A short read-aloud lesson in 4 steps, with pictures and worked examples.
Step 2 · Game
Add from right to left. (6 problems)
Step 3 · Game
Borrow when you need to. (6 problems)
Step 4 · Game
Find the missing number. (4 problems)
Step 5 · Game
Read, listen and solve. (5 problems)
Lesson preview
This is the real lesson text your child hears, read aloud by a friendly voice.
Line up the digits by place value, then start with the ones.
When a column adds to 10 or more, carry the extra ten to the next place.
When subtracting, borrow from the next place if the top digit is too small.
Check with an estimate: 3,456 + 2,378 is about 3,500 + 2,400 = 5,900. Our answer 5,834 is close!
For parents
Learning sticks best when kids use it in real life. Here are simple ideas from this course.
Plan a pretend family budget: add up costs like rent, food and fun, then subtract from a monthly amount. Ask your child to estimate first, then solve.
Practice
Real questions from Big Addition and Subtraction. Try them with your child, then tap to see the answer.
Question 1
72850
Question 2
35500
Question 3
8000
The full course has 21 questions with instant feedback, stars and rewards. Create a free account to play them all.
Big Addition and Subtraction · Questions from parents
Big Addition and Subtraction is a grade 4 math course for kids ages 9–10. That is Year 5 maths in the UK and Year 4 in Australia. It also works well for review in the next grade, or as a challenge for a confident younger learner.
Line up the places, add or subtract from right to left, and regroup when you need to. Check answers by estimating. Along the way they practice: Big Addition; Big Subtraction; Missing Numbers; Big Number Stories.
About 10 minutes in total, split into 4 short levels. Most kids finish it over two or three sessions. Progress is saved, so they can stop any time and pick up where they left off.
Yes. Big Addition and Subtraction is one of the first 2 courses in Grade 4 Math. Create a free parent account and your child can start right away.
No. Every lesson has a friendly read-aloud voice, questions are read aloud too, and the pictures help kids follow along. Confident readers can turn the voice off.
Yes. SkillBloom is built for homeschooling families. Kids work through lessons, games and quizzes on their own, and the parent dashboard shows what they finished and which skills need more practice. It works on phones, tablets and laptops.
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