Page 176 - NUMINO Challenge_M1
P. 176
Type Study To be an even number, the ones place must be an even digit.
The number cards 0 , 2 , 4 belong in the ones place.
The odd digit, 1 , belongs in the tens place.
Find the numbers that satisfy the conditions by placing the digits from the
previous steps in the tree diagram.
0
12
4
Problem solving
1 A 2-digit odd number has a ones digit that is odd.
91, 93, 95, 97, 99
2 An even 2-digit number whose digits can be switched to make another even
number has digits that are both even numbers.
Neither digit can be 0 because if the digits are switched, it won't make a 2-digit number.
There are 5 numbers that satisfy the conditions; 20, 22, 24, 26, and 28.
Type Study 1+3=4, 2+2=4, so the 2-digit numbers that can be made whose digits
have a sum of 4 are 13, 22, and 31.
22 31
An even number has an even ones digit, 22.
22
The 3-digit number is made by placing the same digit in the hundreds place as
in the ones place.
2 2 2 , February 22nd
39Answer Key
The number cards 0 , 2 , 4 belong in the ones place.
The odd digit, 1 , belongs in the tens place.
Find the numbers that satisfy the conditions by placing the digits from the
previous steps in the tree diagram.
0
12
4
Problem solving
1 A 2-digit odd number has a ones digit that is odd.
91, 93, 95, 97, 99
2 An even 2-digit number whose digits can be switched to make another even
number has digits that are both even numbers.
Neither digit can be 0 because if the digits are switched, it won't make a 2-digit number.
There are 5 numbers that satisfy the conditions; 20, 22, 24, 26, and 28.
Type Study 1+3=4, 2+2=4, so the 2-digit numbers that can be made whose digits
have a sum of 4 are 13, 22, and 31.
22 31
An even number has an even ones digit, 22.
22
The 3-digit number is made by placing the same digit in the hundreds place as
in the ones place.
2 2 2 , February 22nd
39Answer Key
