1. How many friends exchanged pictures.
When leaving the summer camp friends exchanged pictures. Each friend gave each other 1 picture. How many friends exchanged pictures if we know that all together they used 6 pictures.
2. How many digits '7'
Joan writes out each of the first 100 counting numbers. How many times did she write the digit 7?
3. How many months in a single year have 28 days?
4. How many candles left.
3 candles were lit. 2 faded. How many candles left.
5. Find the sum of the digits of the first 20 odd numbers
6. Who says '1'?
This problem can be solved by all students in math class sitting in a circle and doing counting.
Five students (Amy, Beth, Corey, Diego, Emily) sit in that order in a circle, counting down to 1. Amy starts by saying, “34”. Then Beth says, “33”, and so on. They continue around the circle to count down by ones. Who says, “1”?
7. How long is the fence?
Ten poles are placed 6 meters apart in a straight line. A fence runs from the first pole to the last pole. How long is the fence?
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