
Method:
Consider the first number 3, start counting after 3 for 4 numbers that is 4,5,6,7. Hence the sum of 3+4 = 7. Consider the third number 5, add this to the sum of 3 +4 7 +5 Start counting after 7 for 5 numbers that is 8,9,10,11,12. Answer: 12 Directions: Add three numbers and select the answer. Also write at least ten examples of your own. 