SME
Grade 4 Math · Problem type
Subtract multi-digit numbers
Use this for “Subtract: 8,214 − 5,639.”
Diagram
44,835 + 28,617 = 73,452
This is an example. Type your own values to start a new problem.
Start
−
Take away
=
Difference
Formulas
73,452 − 28,617 = 44,835
Start − take away = difference
Assumptions
•
Line up the places. Subtract the ones first, then each place to the left.
•
Not enough in a place? Regroup 1 from the next place as 10.
•
Check by adding the difference back to what you took away.
Step-by-step
WE KNOW
Start: 73,452
Take away: 28,617
FIND
difference
Step 1 · Find difference
73,452 − 28,617 = ?
Start − take away = difference
Subtract in columns from the ones. Regroup when needed.
6
12
14
4
12
7
3
4
5
2
−
2
8
6
1
7
4
4
8
3
5
Difference = 44,835
Check
Put the numbers back in. Both sides should match.
73,452 − 28,617 = 44,835 ✓
Topic check
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Related lessons
Place value and rounding to one million
Main lesson
Round multi-digit numbers
Use this for “What is 47,382 rounded to the nearest thousand?”
Compare multi-digit numbers
Use this for “Which is greater: 425,900 or 452,000?” with >, < or =.
Read and write multi-digit numbers
Use this for “Which of these is equal to 6,000 + 60 + 6?” and number names.
Add multi-digit numbers
Use this for sums to 1,000,000 in columns, like 36,325 + 23,310.
Estimate sums
Use this for “About how many in all? 36,325 + 23,310” by rounding first.
Estimate differences
Use this for “About how many more? 61,209 − 27,845” by rounding first.
Subtract across zeros
Use this for “Subtract: 5,000 − 2,346” when the start has zeros to regroup across.