Page 175 - NUMINO Challenge_M1

Answer
Key

Type Study Place the greatest digit, 8 , in the tens place, and place the remaining digits in

the ones place.
85, 82, 81

Place the second greatest digit, 5 , in the tens place and the greatest digit,
8 , in the ones place.
58

The number made from is the fourth greatest number, so the fifth greatest
number is 52.

Problem solving

1 The smallest 3-digit number that can be made is 506. If the ones and tens place

digits are switched, it would make the second smallest number, 560.

2 If the second greatest 2-digit number that can be made using 2 of 3 given digits is

97, then the greatest number that can be made must be 98.
The three number cards are 7, 8, and 9.

4. Numbers that Fit Conditions

EEExxxeeerrrccciiissseee For an even number, the ones place must be 0, 2, 4, 6, or 8. There are 4 even
numbers greater than 10 and less than 20 that are 12, 14, 16, and 18.

EEExxxeeerrrccciiissseee 2-digit numbers whose digits have a sum of 3 are 12, 21, and 30.
The tens digit must be less than the ones digit, so the number that satisfies
the conditions is 12.

38 NUMINO Challenge M1