Page 161 - NUMINO Challenge_L1
P. 161
Answer
Key
Problem solving 3
1 There are 30 numbers from 1 to 30.
The digit 9 is in 9, 19, and 29.
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
The digit 2 is in 2, 12, 20, 21, 22, 23, 24, 25, 26, 27, 28, and 29.
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 13
21 22 23 24 25 26 27 28 29 30
Type Study +
+5=7
-
10 - 6 = 4
,
32 NUMINO Challenge L1
Key
Problem solving 3
1 There are 30 numbers from 1 to 30.
The digit 9 is in 9, 19, and 29.
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
The digit 2 is in 2, 12, 20, 21, 22, 23, 24, 25, 26, 27, 28, and 29.
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 13
21 22 23 24 25 26 27 28 29 30
Type Study +
+5=7
-
10 - 6 = 4
,
32 NUMINO Challenge L1
