Page 143 - NUMINO Challenge_D1

Answer
Key

2 Worm-Eaten Calculations p.16~p.17 Problem solving

Example 0, 0, 5 5, 5 19 13

115 7 Since 3 7 252, 6.
98 252 Since 36 25 ,
25
920 7, 2.
1035 Therefore,
11270 36
77
Example 1 4, 9 9, 4, 8 252
3, 6, 3 1, 6, 7 252
4, 6, 5, 9, 54 2772

Type 2-1 Worm-Eaten Calculations p.18~p.19 2 Find the numbers in the order given below.

1 The result of 9 is a number that has 8 in the 2 729
ones place.
64 4 6 4374
7 2 42
17
2 The product of and must always be a 3- 7 12
54
digit number, so think of a case in which the 54
0
product of and is not a 3-digit number. 5

Since 17 1 17, 27 2 54, and 37 3 111,

cannot be 1 nor 2. 0

3 47

47 2247 Type 2-2 Completing the Equation p.20~p.21
188
1 The number in the tens place of the factor must
367 be either 1 or 2.
329
2 If 2, the same number should be repeated,
38 or the result should be a 3-digit number,
therefore must be 1.

NUMINO Challenge D1