Question

Dr. Crypto has 4 boxes, and each box has 10 carrots. How many carrots does he have in all? Identify the option with the correct sequence and the total number of carrots.

• A. 10, 20, 30, 40; Total = 40
  
• B. 4, 10, 20, 30, 40; Total = 40
• C. 4, 9, 14, 19, 24, 29, 34, 39, 40; Total = 40
• D. 5, 10, 15, 20, 25, 30, 35, 40; Total = 4
  

Answer 1

The correct option is A 10, 20, 30, 40; Total = 40


Say: Let us skip count to find the total number of carrots.

Steps:
$\bullet$ We know that there are 4 boxes, and each box has 10 carrots in it.
$\bullet$ In order to find the total number of carrots Dr. Crypto has in all, we skip count by 10s four times.
$\bullet$ In the first box there are 10 carrots. In two boxes, there will be 10 + 10 = 20 carrots. In three boxes, there will be 20 + 10 = 30 and in four boxes, there will be 30 + 10 = 40 carrots.
$\bullet$ So, the sequence is 10, 20, 30, 40, and the total number of carrots is 40.
$\bullet$ Hence, option D is correct.

WB: If required, use the whiteboard to find the total number of carrots as shown.


Error Analysis Question:
Q. If there were 9 boxes with 5 carrots in each box, the number of carrots would be the same as 4 boxes with 10 carrots in each. Is this true? Explain.
A. No, if there were 9 boxes with 5 carrots in each, there would be 45 carrots. Whereas 4 boxes with 10 carrots in each is 40 carrots.