Labels
- 2D spatial reasoning
- 3D spatial reasoning
- alternate number bases
- area problems
- consecutive numbers and other sequences
- counting problems
- factors and multiples
- finding and extending patterns
- fractions
- geometry
- graph theory
- logic
- nets
- number bond practice for young children
- place value
- practice with addition/subtraction
- practice with decimal arithmetic
- practice with multiplication
- reflections/rotations

Saturday, August 13, 2016
Tuesday, April 19, 2016
Factor Trees
Solution:
There are different ways to fill in the missing numbers on the trees, but importantly one thing is always the same. The numbers you end up with on the bottoms of the branches are always the prime factors of the number at the top. Think about the 40 tree for example. We can make a 40 tree in many different ways:
Notice that any way we construct the branches, we end up with 5, 2, 2, 2 at the bottom. The fact that we always end up with the same prime numbers, no matter how we factor a number is so important that it is called The Fundamental Theorem of Arithmetic.
Saturday, April 9, 2016
Tuesday, March 1, 2016
Tuesday, January 26, 2016
Monday, January 11, 2016
Mobius Highway
One way to see this is to cut the two lanes apart. You end up with a single strip of paper, but this time it is twisted twice, so it is no longer a Mobius strip. (It has 2 sides rather than 1.) You can see from the photo that the red and blue cars are on one side of the strip, heading toward each other.
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