Watch first - 3rd Grade Math Foundations for Rounding Numbers
TEKS 3.2C - represent a number on a number line as being between two consecutive multiples of 10; 100; 1,000; or 10,000 and use words to describe relative size of numbers in order to round whole numbers;
Explain
Tell your partner how to round 3,413 to the nearest thousand using the benchmark numbers of 3,000 and 4,000.
Look
Using the image below, tell your partner what 827 rounds to (nearest hundred) and how you know.
Associate
Rounding numbers is a useful skill when shopping. Tell your partner about a situation in which you might want to round numbers while shopping at a store.
Build
Using the number 439, discuss with a partner which benchmark numbers you would use if you rounded it to the nearest ten, the nearest hundred, and the nearest thousand.
Organize
There’s a rule for knowing if a number will round up or down to the nearest benchmark number. Discuss with your partner which digits make a number round up and which digits make a number round down. Does this rule apply to rounding big numbers as well as small numbers?
Reflect
Share with your partner your level of understanding of rounding numbers. Are you better with rounding small numbers to the nearest ten or large numbers to the nearest thousand? Why?
Analyze
Kim and Jeremy are trying to round 157 to the nearest ten. Kim says that 157 rounds to 150 because it has a 5 in the tens place. Jeremy says that 157 rounds to 160 because it’s closer to 160 than 150. Who is correct? Why?
Try
Think of a number that rounds to the following places:
Tens place - rounds to 150
Hundreds place - rounds to 100
Tell your partner what your number is and why it rounds to each place.
Extend
Once you learn how rounding works, you can use the same pattern to round larger and larger numbers. Work with a partner to round the following number to the millions and ten millions place.
123,456,789
PEEPS Conversation Starters
After your partner talks, try using one of these response stems to keep the conversation going:
Paraphrase: "You think that..." or "What I understood you say was that..."
Elaborate: "Tell me more about..." or "What does ___ mean?"
Examples: "A real-world example of this is..." or "You can see an example of this..."
Piggyback: "Another way to think about that is..." or "This reminds me of..."
Synthesize: "We can agree on..." or "The main point of what we learned is..."