**Fourth Grade Math**

This book, with over 250 problems, covers the following topics:

Number Theory / System, Addition / Subtraction, Multiplication / Division, Fractions / Decimals, Patterns, Geometry, Algebra, Metric System, and more!

If you are home schooling (or if you are just trying to get extra practice for your child), then you already know that math workbooks and curriculum can be expensive. Home School Brew is trying to change that! We have teamed with teachers and parents to create books for prices parents can afford. We believe education shouldn’t be expensive.

The problem portion of the book may also be purchased individually in "Fourth Grade Math Problems."

Number Theory / System, Addition / Subtraction, Multiplication / Division, Fractions / Decimals, Patterns, Geometry, Algebra, Metric System, and more!

If you are home schooling (or if you are just trying to get extra practice for your child), then you already know that math workbooks and curriculum can be expensive. Home School Brew is trying to change that! We have teamed with teachers and parents to create books for prices parents can afford. We believe education shouldn’t be expensive.

The problem portion of the book may also be purchased individually in "Fourth Grade Math Problems."

## Print Copy: Fourth Grade Math

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**Excerpt**

Estimating and Rounding Numbers

Although numbers seem to be an exact measurement, count, or calculation of what you have, need, or should sell, sometimes they are almost correct or basically “close enough.” For most of our daily needs, calculations, and measurements an estimate or our “best guess” is all that is required to get the answer that best solves our problem.

An estimate is usually based on a previous or a few previous values regarding the same or similar situation. For example, if you had a professional painter come to your house and paint three bedrooms for a cost of $150 per bedroom, you would estimate the cost to have another room of similar size painted to also be about $150. The actual cost might be $140 or $160 but an estimate only needs to be close to the actual answer.

People also estimate how long certain activities will take. For example, if it took Mary 3 hours to clean the kitchen after the Halloween party, she estimates that it will also take about 3 hours to clean up after the St. Patrick’s Day party. It may take slightly less time or slightly more time, but that is what an estimate does. It puts you close to the actual answer.

Rounding numbers is a specialized type of estimate. To round a number up or down, you need to decide to which place value you want or need to round the number. Your decision to round a number is usually based on the need to simplify the number to make it easier to use in a calculation or series of calculations.

There is one main rule that dictates whether you will round up or down. If the number to the right of the place you need to round is 5, 6, 7, 8, or 9 you will round the original number up by 1 place value and the 5, 6, 7, 8, or 9 becomes a zero. If the number to the right is 4, 3, 2, or 1 you will leave the original number alone but convert the 4, 3, 2, or 1 to a zero. Here are some examples to help you visualize this concept:

Round to the Nearest Tens

27 would round up to 30, while 23 would round down to 20

32 would round down to 30, 38 would round up to 40

112 would round down to 110, 116 would round up to 120

Round to the Nearest Hundreds

258 would round up to 300, 201 would round down to 200

385 would round up to 400, 428 would round down to 400

1,562 would round up to 1,600, 3,221 would round down to 3,200

Round to the Nearest Thousands

3,501 would round up to 4,000, 2,287 would round down to 2,000

5,882 would round up to 6,000, 1,297 would round down to 1,000

3,529 would round up to 3,000, 3,345 would round down to 3,000

Although numbers seem to be an exact measurement, count, or calculation of what you have, need, or should sell, sometimes they are almost correct or basically “close enough.” For most of our daily needs, calculations, and measurements an estimate or our “best guess” is all that is required to get the answer that best solves our problem.

An estimate is usually based on a previous or a few previous values regarding the same or similar situation. For example, if you had a professional painter come to your house and paint three bedrooms for a cost of $150 per bedroom, you would estimate the cost to have another room of similar size painted to also be about $150. The actual cost might be $140 or $160 but an estimate only needs to be close to the actual answer.

People also estimate how long certain activities will take. For example, if it took Mary 3 hours to clean the kitchen after the Halloween party, she estimates that it will also take about 3 hours to clean up after the St. Patrick’s Day party. It may take slightly less time or slightly more time, but that is what an estimate does. It puts you close to the actual answer.

Rounding numbers is a specialized type of estimate. To round a number up or down, you need to decide to which place value you want or need to round the number. Your decision to round a number is usually based on the need to simplify the number to make it easier to use in a calculation or series of calculations.

There is one main rule that dictates whether you will round up or down. If the number to the right of the place you need to round is 5, 6, 7, 8, or 9 you will round the original number up by 1 place value and the 5, 6, 7, 8, or 9 becomes a zero. If the number to the right is 4, 3, 2, or 1 you will leave the original number alone but convert the 4, 3, 2, or 1 to a zero. Here are some examples to help you visualize this concept:

Round to the Nearest Tens

27 would round up to 30, while 23 would round down to 20

32 would round down to 30, 38 would round up to 40

112 would round down to 110, 116 would round up to 120

Round to the Nearest Hundreds

258 would round up to 300, 201 would round down to 200

385 would round up to 400, 428 would round down to 400

1,562 would round up to 1,600, 3,221 would round down to 3,200

Round to the Nearest Thousands

3,501 would round up to 4,000, 2,287 would round down to 2,000

5,882 would round up to 6,000, 1,297 would round down to 1,000

3,529 would round up to 3,000, 3,345 would round down to 3,000