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If you have a picture of a large number of items, portion off a section and count how many items are in that section. You can then multiply by how many sections there are in the whole picture.
This is sometimes called "clump counting."

# Making Sums and Differences Worksheets

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Basic Lesson
Students learn pre-algebra skills to prepare them for higher level operations. Also includes practice problems.
Standard: MATH 4
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Intermediate Lesson
Uses larger number set for sums and differences than are presented in the basic lesson.
Standard: MATH 4
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Independent Practice 1
20 practice problems with a solution and operators present. The answers can be found below.
Standard: MATH 4
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Independent Practice 2
20 more problems for you. Answer keys can be found below.
Standard: MATH 4
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Making Sums and Differences Homework Worksheet
Contains 12 problems. Two examples are provided.
Standard: MATH 4
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Making Sums and Differences Quiz
10 problems that test introductory algebra skills.
Standard: MATH 4
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Tips For Guessing How Many Jellybeans Are In A Jar
Learn how to make a good estimate of how many jellybeans are in jar.
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How to Reduce Anxiety and Nervousness on Math Tests
Math tests can be overwhelming and threatening at the same time.
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