2
DAY 4
Learn
Comparing three numbers (PR1ME p. 36)
Practice 5 (PR1ME p. 37)
Learning Outcome:
Work through the exercises together.
Compare and order numbers within 1000
•
Task 1(a): Guide students to compare the hundreds of the three numbers and conclude that since 3 hundreds is smaller than 5 hundreds, 354 is the smallest number. Then, guide students to compare the tens of 521 and 582 and conclude that since 8 tens is greater than 2 tens, 582 is the greatest number. Task 1(b): Guide students to compare the hundreds of the three numbers and conclude that since 6 hundreds is greater than 4 hundreds, 611 is the greatest number. Then, guide students to compare the tens of 451 and 425 and conclude that since 2 tens is smaller than 5 tens, 425 is the smallest number. Task 1(c): Guide students to compare the hundreds of the three numbers and conclude that since 5 hundreds is greater than 3 hundreds, 582 is the greatest number. Then, guide students to compare the tens of 321 and 354 and conclude that since 2 tens is smaller than 5 tens, 321 is the smallest number. Task 1(d): Guide students to compare the hundreds of the three numbers and conclude that since 5 hundreds is smaller than 6 hundreds, 562 is the smallest number. Then, guide students to compare the tens of 634 and 643 and conclude that since 4 tens is greater than 3 tens, 643 is the greatest number.
Stage: Abstract Representation Students will compare and order three numbers by first comparing the hundreds, then the tens, and lastly the ones. Copy the place value chart shown on PR1ME p. 36 on the board without filling in the numbers. − Have three students fill in the chart to show the numbers 238, 170 and 209. − − Guide students to compare the digits in the hundreds place of the three numbers and conclude that since 1 hundred is smaller than 2 hundreds, 170 is smaller than 209 and 238. − Next, guide students to compare the digits in the tens place of 238 and 209 and conclude that since 3 tens is greater than 0 tens, 238 is greater than 209. − Guide students to see that since 238 is greater than 209 and 238 is greater than 170, 238 is the
greatest number. Similarly, have students conclude that 170 is the smallest number.
− Guide students to arrange the numbers in order from the greatest to the smallest number.
Task 2: Guide students to compare and order three numbers, beginning with the smallest.
Teaching Tips
➢ Highlight to students that they have to start comparing numbers by looking at the digits in the greatest place value. Point out that they need to compare the digits in the tens place only if the digits in the hundreds place are the same. ➢ Point out to students that when comparing three numbers, they can compare the numbers two at a time.
For answers, go to Answer Key.
Grade 2 I Teacher’s Guide 47
Made with FlippingBook - Online catalogs