Teacher Math Lesson: Double Double Strategy for 4x Times Tables
Provided students are able to double numbers up to 18, they will be able to work out 4x number facts by doubling the other number twice. For example:
4 x 8 = double (double 8)
4 x 8 = double 16
4 x 8 = 32
This strategy can be extended for use with larger numbers, of course. For example:
4 x 350 = double (double 350)
4 x 350 = double 700
4 x 350 = 1400
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