Page 113 - NUMINO Challenge_A1

Answer
Key

Creative Thinking

1 Write the numbers in the blanks in order from greatest to smallest.

321 320 312 310 302 301
201 203 210 213 230 231
132 130 123 120 103 102
312 103 209

2 Use the conditions in the order of to find the 3-digit numbers that meet the

conditions.

No digit in the number is repeated. All digits are smaller than 5. 0, 1, 2, 3, 4

The number is divisible by 5. 0

The digit in the tens place is an even number. 20, 40

Therefore, the possible numbers are as shown below.

4
3 20
1
3
2 40
1

The 3-digit numbers that meet the conditions are 120, 140, 240, 320, 340, and 420.

3 When 9 is the 1-digit number, the product of the 3-digit number and the 1-digit number

can be the greatest. The remaining number cards should be arranged in order from
greatest to smallest in the hundreds, tens, and ones place.
Therefore, the greatest product is 875 9 7875.

4 The digit represented by in the ones column can either be 0 or 5.

If 0, the addition sentence 4 cannot be true in the equation

0 0 0 40. Therefore, 5 and 1.

5
5
5

45

8 NUMINO Challenge A1