Rounding Whole Numbers and Decimals

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Presentation transcript:

Rounding Whole Numbers and Decimals WE ARE LEARNING TO: We will be able to round whole numbers and decimals

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Rounding Whole Numbers Remember the 4 steps Underline the digit in the place to be rounded. STEP 2: Look at the digit to the right of the underlined digit STEP 3: If the digit is five or above… give it a shove (add 1 to the underlined digit) STEP 4: Replace all digits after the underlined digit with zeros

Rounding Decimals Remember the 4 steps Underline the digit in the place to be rounded. STEP 2: Look at the digit to the right of the underlined digit STEP 3: If the digit is five or above… give it a shove (add 1 to the underlined digit) STEP 4: Drop the digit after the underlined digit

Let’s try one… Mrs. Bogusch has a pair of Beats headphones. She told the students she would sell it to them for $147 rounded to the nearest ten. How much would you pay to own the Beats? ANSWER: $150

How about this one… Mrs. Kilgallon has a nice gently used Copper Mini Car. She told the students she would sell it to them for $13,349 rounded to the nearest hundred. How much would you pay to own the car? ANSWER: $13,300

How about this one… Mrs. Cassner has a rainbow loom. She told the students she would sell it to them for $17.89 rounded to the nearest tenth. How much would you pay to own the loom? ANSWER: $17.90

Try a few on your own 1. 765 Answer: 800 2. 106,950 Answer: 107,000 3. 5,750 Answer: 5,800 4. 692,300 Answer: 690,000 5. 3,750 Answer: 5,400 Step 1- Underline the digit in the place to be rounded Step 2- Look at the digit to the right of the underlined digit Step 3- If the digit to the right is 5 or greater, add 1 to the underlined digit Step 4- Replace all digits after the underlined digit with zeros

Real-World Problem The table below shows a what a 95-pount 5th grader would weigh on the Sun and on different planets Place Weight (lb) Jupiter 224.58 Mars 35.815 Sun 2,571.84 Round the weight of each place to the following place indicated: 1. Mars- tenths 2. Jupiter- tens 3. Sun- thousands 4. Jupiter-tenths