Page 76 - NUMINO Challenge_M2

EExxpplloorree An addition expression (2-digit number)+(2-digit number) is

made using the number cards 1 , 3 , 6 , and 7 .
To make the greatest sum, 6 , 7 must be used in the tens
place with 1 , 3 in the ones place.
To make the smallest sum, 1 , 3 must be used in the tens
place with 6 , 7 in the ones place.

Greatest Sum Smallest Sum

61 61 16 16
+7 3 +7 3 +3 7 +3 7
13 4
53

A subtraction expression (2-digit number) - (2-digit number) is
made using the number cards 1 , 3 , 6 , and 7 .

To make the greatest difference, the number that is subtracted
from must be made the greatest and the number that is
subtracted must be made the smallest.

Greatest Difference

76 76

-1 3 -1 3

63

Make the greatest Make the second
difference greatest difference

EExxeerrcciissee Use the four number cards 2 , 5 , 6 , and 9 once to make
2-digit numbers and find the greatest sum and the greatest difference.

73Operations