Page 142 - NUMINO Challenge_C2

Creative Thinking p.14~p.15 2 Numbers and Number of Digits p.16~p.17

1 2,998 3,002 (3,000 2) (3,000 2) Example 999, 10, 1, 990
99, 10, 1, 90, 999, 100, 1, 900
3,000 3,000 6,000 6,000 4 3, 90, 900, 2880
9,000,000 4
8,999,996

2 321 TryItAgain There are 105 5 1 101 numbers. The
number of 1-digit numbers is 9 5 1 5,
100 the number of 2-digit numbers is 99 10
1 90, and the number of 3-digit numbers is
4 105 100 1 6 .
Therefore, there are 5 1 90 2 6 3
1 284 203 digits.

000

1

3 321

16 1

321 41 13161.

3 15 26 Example 30, 0, 0, 2, 9 30 100
30, 30, 100, 160
15 1
45 3 Type 2-1 Number of Digits (1) p.18~p.19
135 9
405 27
390 26

27 1 26
405 15 390

4 19 25 475 1 The numbers that go in the blanks are:
1, 0, 1, 1, 8, 8, 8, 9.
19 25 19 2 9 r1 There are 89 10 1 80 digits.
19 50 9 2 4 r1
14 100 4 2 2 2 The numbers that go in the blanks are:
12 200 2 2 1 1, 0, 1, 1, 8, 8, 8, 9.
11 400 1 2 0 r1 There are 89 10 1 80 digits.

475 3 900, 1 number

25 50 400 475 4 80 80 1 161 times

Answer Key