Page 41 - NUMINO TG_2A

Activity 2 Comparing and Ordering Numbers

jOb ective Solve problems by comparing 3-digit numbers.

1. Textbook Instructions Activity 2 Comparing and Ordering Numbers

Explain to students that depending on the 1 Circle all the numbers greater than the number in a rectangle.
location of a digit in a number, the value of the
digit will change. a 320 430 512 259 340 199
3 in 326 is in the hundreds place, so it is 326
300.
2 in 326 is in the tens place, so it is 20. b 140 133 109 211 116 128
6 in 326 is in the ones place, so it is 6. 127

1. When comparing more than 2 numbers, c 912 892 905 799 900 940
students can make mistakes, so have them 903
compare the numbers one by one.
d 702 572 569 609 577 98
2. There are 2 ways to find numbers that go 575
in the .
2 Compare the 3-digit numbers. Circle all the possible numbers for .
Try writing all the given numbers in the
blank one by one to find the answer. a 1 123456789
Compare the numbers in the hundreds 638 > 6
place, tens place, and ones place to find
the answer. b > 526 123456789
52
Have students find various ways other than
the ones above to find the answers. c 29 123456789
714 >

d 80 123456789
459 >

16

2. Build Understanding

Comparing Numbers How to compare numbers one by one.
There are 2 ways to compare more than 2 numbers. Solution: If you compare 903 and 892, 892 is smaller.
Example: 1c. Find the numbers greater than 903.
So, eliminate 892.
c 912 892 905 799 900 940 If you compare 903 and 799, 799 is smaller.
903 So, eliminate 799.
If you compare 903 and 900, 900 is smaller.
Answer: 912, 905, 940 So, eliminate 900.

024 NUMINO Teacher s Guide