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."

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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
Grades: (3-5); View worksheet

Intermediate Lesson: Uses larger number set for sums and differences than are presented in the basic lesson.; Standard: MATH 4
Grades: (3-5); View worksheet

Independent Practice 1: 20 practice problems with a solution and operators present. The answers can be found below.; Standard: MATH 4
Grades: (3-5); View worksheet

Independent Practice 2: 20 more problems for you. Answer keys can be found below.; Standard: MATH 4
Grades: (3-5); View worksheet

Making Sums and Differences Homework Worksheet: Contains 12 problems. Two examples are provided.; Standard: MATH 4
Grades: (3-5); View worksheet

Making Sums and Differences Quiz: 10 problems that test introductory algebra skills.; Standard: MATH 4
Grades: (3-5); View worksheet

Tips For Guessing How Many Jellybeans Are In A Jar: Learn how to make a good estimate of how many jellybeans are in jar.; View Math Article

How to Reduce Anxiety and Nervousness on Math Tests: Math tests can be overwhelming and threatening at the same time.; View Math Article

More Advanced Math Worksheets

More Advanced Worksheets: The next level of math skills.; -Visually Estimate
-Estimate Large Operations
-Estimating Weight and Volume
-Rounding Numbers To Tens

Less Advanced Math Worksheets

Remedial Math Worksheets: Skills needed to get to this level.; -Estimating the Half Way Point
-Estimate on a Number Line
-Estimate the Objects
-Estimating Length