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The answer depends on what tables you know.

For a very naive user:

220 * 19 = (200 + 20)*(20 - 1) = 200*20 - 200*1 + 20*20 - 20*1

= 4000 - 200 + 400 - 20 = 4180

For more proficient users:

220 * (20 - 1) = 220*20 - 220*1

= 4400 - 220 = 4180

or

(200 + 20)*19 = 200*19 + 20*19

= 3800 + 380 = 4180

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Q: What is 220x19 in distributive property?
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