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In subtracting negative and positive integers, change the sign on the subtrahend.
If both signs are positive, the answer will be positive. 15 - (-3) = 15 + 3 = 18
If both signs are negative, the answer will be negative. -15 - (+3) = -15 - 3 = -18

# 3 & 4 Digit from 4 Digit Subtraction

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Basic Lesson
Demonstrates how to set the problem up using column subtraction.
Standard: MATH 1
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Intermediate Lesson
This lesson demonstrates how to borrow between columns.
Standard: MATH 1
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Independent Practice 1
Contains 20 three and four digit from four digit subtraction problems. The answers can be found below.
Standard: MATH 1
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Independent Practice 2
Another 20 practice problems. The answer key is below.
Standard: MATH 1
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Homework Worksheet
Reviews the skills within the unit and provides 12 practice problems.
Standard: MATH 1
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Three and Four Digit from Four Digit Subtraction Quiz
10 three and four digit from four digit subtraction math problems to help assess the unit. A math scoring matrix is included.
Standard: MATH 1
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Answers for the homework and quiz.
Answers for both lessons and both practice sheets.

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Remedial Math Worksheets
Skills needed to get to this level.
-Subtraction Numbers 0 to 9
-Number Line Subtraction
-Picture Subtraction
-Visual Subtraction