Page 94 - NUMINO Challenge_M1

EExxeerrcciissee How many even numbers are greater than 10 and less than 20?

EExxpplloorree The following method shows how to find the numbers that satisfy
conditions of each place value.

2-digit numbers that have digits with a sum of 4
Find all the numbers with a sum of 4. 1+3=4, 2+2=4,
0+4=4
Use the digits found to make numbers. 13, 22, 31, and 40

Numbers less than 40 that have tens place greater than the ones
place

Find the possible tens digits when the number is less than 40.
1, 2, 3
Find the numbers that have a tens place greater than the ones

place.

Tens place Ones place Numbers

1 0 10
2 0, 1 20, 21
3 0, 1, 2 30, 31, 32

10, 20, 21, 30, 31, and 32

EExxeerrcciissee How many numbers satisfy the given conditions?

Conditions

2-digit number that have digits with a sum of 3.
The tens place is less than the ones place.

Numbers 91