The number of students in each of the seventh grade home rooms that volunteer in the office are shown in the table. Use mental math to find the total number of students who volunteered. Explain.
There are 8 home rooms in the seventh grade, and the table shows that each home room has 3 students volunteering in the office. To find the total number of students who volunteered, we can use mental math to multiply 8 (the number of home rooms) by 3 (the number of students volunteering in each home room). 8 x 3 = 24, so 24 students volunteered in the office.
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from the posted question.
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To find the total number of students who volunteered, we need to add up the number of students in each home room. Given that we need to use mental math, we can use an efficient strategy called "chunking."
Looking at the table, we can see that there are three home rooms: A, B, and C. The number of students in each home room is given as 23, 19, and 14, respectively.
We can start by adding the largest numbers first, which would be 23 and 19. Adding those together mentally gives us 42.
Next, we can add the resulting sum (42) to the number in the third home room, which is 14. Adding 42 and 14 gives us 56.
Therefore, the total number of students who volunteered is 56.
In summary, we used the strategy of chunking by adding the largest numbers first (23 and 19) and then adding the resulting sum (42) to the last number (14) to find the total number of students who volunteered.