24 videos in "Computation Shortcuts"
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Ex 1 - Multiplying numbers with 25
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Ex 2 - Multiplying numbers with 25
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Ex 3 - Multiplying numbers with 25
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Ex 1 - Multiplying numbers with 11
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Ex 2 - Multiplying numbers with 11
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Ex 3 - Multiplying numbers with 11
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Ex 1 - Multiplying numbers with 5
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Ex 2 - Multiplying numbers with 5
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Ex 3 - Multiplying numbers with 5
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Ex 1 - Multiplying numbers using Line Intersection
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Ex 2 - Multiplying numbers using Line Intersection
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Ex 3 - Multiplying numbers using Line Intersection
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Ex 1 - Dividing numbers by 25
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Ex 2 - Dividing numbers by 25
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Ex 3 - Dividing numbers by 25
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Ex 1 - Dividing numbers by 5
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Ex 2 - Dividing numbers by 5
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Ex 3 - Dividing numbers by 5
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Ex 1 - Subtracting from multiples of 10
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Ex 2 - Subtracting from multiples of 10
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Ex 3 - Subtracting from multiples of 10
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Ex 1 - Squaring numbers ending with 5
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Ex 2 - Squaring numbers ending with 5
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Ex 3 - Squaring numbers ending with 5
Ex 3 - Subtracting from multiples of 10
Meets these NCTM Standards:
- How do you subtract a number from a multiple of 10?
- Is there a quick and easy shortcut or trick for subtracting numbers from multiples of ten?
- How can you find 781000 - 301 quickly?
This video shows a good and useful method for subtracting numbers from a multiple of ten, such as 10000, 800000, and 781000. Great for quick mental math computations.
