Rounding Whole Numbers Lesson 3-5 CCSS 4.NBT.3 Literature Link: Great Estimations by Bruce Goldstone

MATH Essential Questions What kind of experiences help develop number sense? MATH Essential Questions

MATH Essential Questions How can we estimate numbers? MATH Essential Questions

Warm Up Write the following numbers in expanded form. 47,902 348,729 201,565

When is rounding numbers helpful? Think and Write When is rounding numbers helpful?

Vocabulary Estimate: To replace the exact number with the number that tells about how many to the closest ten or hundred. “Round” is another word for estimate.

Rounding numbers When rounding a number, always look to the digit to the right of the place you are rounding to. If the number in the place is 4 or lower, round DOWN. If the number in the place is 5 or higher, round UP.

Rounding Song

Rounding Practice Round each number to the nearest ten and hundred. 45,678 3,212 19,753 213,908

Rounding Practice! Round each number to the place of the underlined digit. 361,204 809,143 922,876 187,863

Problem 1 Animal Number in Wild Leatherback Turtle 59,984 Giant Panda Round the number of each type of endangered animal in the wild to the nearest thousand. Animal Number in Wild Leatherback Turtle 59,984 Giant Panda 1,132 Gorilla 125,121 White Rhino 19,814 Elephant 356,792

Problem 2 Melissa sold 2,132 raffle tickets. Hayla sold 9,983 raffle tickets. Giana sold 3,521 raffle tickets. Round each number to the nearest thousand to estimate how many tickets were sold altogether.

Wrap UP In this lesson, you learned how to use place value to round numbers through the hundred thousands. . For homework, 3-5 Practice if you are comfortable with rounding. If you want more practice, try 3-5 Reteaching. Website for Practice: http://www.abcya.com/rounding_numbers.htm