Rounding Using Number Lines Rounding is finding the
Rounding Using Number Lines
Rounding is finding the closest friendly (benchmark) number to an original number.
Round 346 to the nearest 100 (hundred) 1) Underline the place being rounded. 346 2) Draw a number line using the hundreds place underlined as the lower benchmark and the next hundred as the higher benchmark. 300 400
Round 346 to the nearest 100 (hundred) 3) Determine the midpoint number. Write the midpoint number in the middle of the number line. 300 350 400
Round 346 to the nearest 100 (hundred) 4) Write about where the original number would be on the number line. 300 350 400 346 ** Since 346 is on the 300 side, 346 rounds to 300.
Round 567 to the nearest 10 (ten) 1) Underline the place being rounded. 567 2) Draw a number line using the ten underlined as the lower benchmark and the next number as the higher benchmark. 60 70 **Don’t forget the 5 oo in front of the 60. 560 570
Round 567 to the nearest 10 (ten) 3) Determine the midpoint number. Write the midpoint number in the middle of the number line. 60 560 65 565 70 570
Round 567 to the nearest 10 (ten) 4) Write about where the original number would be on the number line. 60 560 65 565 70 567 ** Since 567 is on the 570 side, 567 rounds to 570.
Round 1642 to the nearest 1000 (thousand) 1) Underline the place being rounded. 1642 2) Draw a number line using the hundreds place underlined as the lower benchmark and the next number as the higher benchmark. 1000 2000
Round 1642 to the nearest 1000 (thousand) 3) Determine the midpoint number. Write the midpoint number in the middle of the number line. 1000 1500 2000
Round 1642 to the nearest 1000 (thousand) ) Write about where the original number would be on the number line. 1000 1500 2000 1642 ** Since 1642 is on the 2000 side, 1642 rounds to 2000.
Round 1839 to the nearest 100 (hundred) 1) Underline the place being rounded. 1839 2) Draw a number line using the hundreds place underlined as the lower benchmark and the next number as the higher benchmark. 800 900 **Don’t forget the 1, 00 o in front of the 800. 1800 1900
Round 1839 to the nearest 100 (hundred) 3) Determine the midpoint number. Write the midpoint number in the middle of the number line. 800 1800 850 1850 900 1900
Round 1839 to the nearest 100 (hundred) 4) Write about where the original number would be on the number line. 800 1800 850 1850 900 1839 ** Since 1839 is on the 1800 side, 1839 rounds to 1800.
Round 1272 to the nearest 10 (ten) 1) Underline the place being rounded. 12 72 2) Draw a number line using the ten underlined as the lower benchmark and the next number as the higher benchmark. 70 80 **Don’t forget the 1, 200 in front of the 70. 1270 1280
Round 1272 to the nearest 10 (ten) 3) Determine the midpoint number. Write the midpoint number in the middle of the number line. 70 1270 75 1275 80 1280
Round 1272 to the nearest 10 (ten) 4) Write about where the original number would be on the number line. 70 1270 75 1275 80 1272 ** Since 1272 is on the 1270 side, 1272 rounds to 1270.
- Slides: 17