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P. 18
A number under the given conditions
Find the numbers that satisfy the following conditions.
< Conditions > ① It is an even number.
0, 2, 4, 6, 8
It is less than 50.
② The number in the tens place is twice
It is an even number. the number in the ones place.
42, 84
The number in the
tens place is twice ③ It is less than 50.
the number in the 42
ones place.
Example 1 Find all the numbers that satisfy a given condition.
⑴ ⑵
202
62 37 388
82 15 138 944
The sum of each The numbers in the tens
digit is 10. place and ons place are
the same.
2. A number under the conditions 15
Find the numbers that satisfy the following conditions.
< Conditions > ① It is an even number.
0, 2, 4, 6, 8
It is less than 50.
② The number in the tens place is twice
It is an even number. the number in the ones place.
42, 84
The number in the
tens place is twice ③ It is less than 50.
the number in the 42
ones place.
Example 1 Find all the numbers that satisfy a given condition.
⑴ ⑵
202
62 37 388
82 15 138 944
The sum of each The numbers in the tens
digit is 10. place and ons place are
the same.
2. A number under the conditions 15
