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How many pieces of paper are there?

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How many classes are there?

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How many papers are in a class set?

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How fast does 1 person count?

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How many students helped with the counting?

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Use a timer to see how long it takes 1 person to count 25 papers

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We tested 4 students counting to 25 papers and the MEAN time was 41 seconds.

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We tested 4 students counting to 25 papers and the MEAN time was 41 seconds.

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Do they count by 1's or 5's?

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What information do we think is important

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What information do we think is important

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We know that it takes 41 seconds to count out 1 class.

We know that there are 33 classes.

We know that there are 7 people counting.

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We think we need to use multiplication. If we multiply 33 (classes) x 41 (seconds) we will get the total time.

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This would be correct if ONLY 1 person were counting, but there are 7 people counting.

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This would be correct if ONLY 1 person were counting, but there are 7 people counting.

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We think we need to divide 900 (papers) by 33 (classes).

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This would give you the amount of papers per classroom, not total time, and we already know that there are 25 papers per class.

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This would give you the amount of papers per classroom, not total time, and we already know that there are 25 papers per class.

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We think we need to multiply 41 (seconds) by 7 (people) to see how long it takes them to count 1 class each.

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The students are counting at the SAME time so it takes 7 people 41 seconds to count 7 classes

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The students are counting at the SAME time so it takes 7 people 41 seconds to count 7 classes

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We decided to work it out using a graphic organizer (t-table).

Time | Classes
41 | 7
82 | 14
123 | 21
164 | 28

205

33

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The time column increases by 41 each stage. The classes column increases by 7 each stage. We can solve it using patterning

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We divided 33 (classes) by 7 (students) and got 4.7. We rounded up to 5. Then we multiplied 41 (seconds) x 5.

We got 205 total seconds to count the sheets.

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We watched the time lapse video of the students actually counting out the papers, and instead of 3.4 minutes it took almost 15. We discussed why there were differences between the calculated time and the actual time. We did not take into account:

1. Putting the stacks into the envelopes

2. Organizing the envelopes

3. All 7 students cannot count from the same stack at the same time

4. They are not counting continuously, there is transition time

5. They are talking with each other, so they are not all counting as fast as they can.