4.NBT.5
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In this standard, students are expected to multiply two whole numbers using strategies based on place value, properties, and visual models. Students must be able to explain the strategy they are using.
Example:
2,384 x 5 = 11,920
2,000 x 5 = 10,000
300 x 5 = 1,500
80 x 5 = 400
4 x 5 = 20
Example:
85 x 79 = 6,715
80 x 70 = 5,600
80 x 9 = 720
70 x 5 = 350
5 x 9 = 45