Page 144 - NUMINO Challenge_D1

3 Since is 1, use numbers besides 17 2 Since the difference
1 and 4 in the ones place. Then we 4
have four equations satisfying the between 4-digit number

and 3-digit number is a 2-

conditions of non-repetition: 13 68 digit number, should

4 52, 17 4 68, 18 4 72, 25 be greater than by 1, and should be
and 19 4 76. If the equation is 93
12 4 68, and you add 25 as the smaller than . Therefore, 1, 0, and

9. The remaining six numbers should be

2-digit number, the sum is 93 and is true. For the used only once to complete the subtraction.

equations 13 4 52, 18 4 72, and 19 4

76, if you use the remaining numbers, the same 1023 1032
945 947
number should be repeated or the result will be a 78 or 85

3-digit number. Therefore, 7. Answers will vary.

Problem solving 9 Creative Thinking p.22~p.23
7
1 Only 1 can be . If represents 2. 1 The number in the ones place , in 7, is 1.

2, 3, 4, 5, 7, or 8, other numbers 3
should be repeated. Therefore,
384 3843
can only represent 6. In this 7 7
case, 5 and 4. Since
each number card can be used 1 26901
only once, 8, 1, 3, and 1 51 5

9 2 12 1
6
The number in the ones place , in 3843 ,
54 is 5. 5
78

132

3843
57

26901
19215
219051

Answer Key