432 = 3 x (12 x 12) = 3 x 144 = 3 gross
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Oh, dude, if you bought 3 gross of pencils, you would have 432 pencils. Yeah, that's right, a gross is 144 pencils, so just multiply 144 by 3 and boom, you've got yourself a whole lot of pencils. Like, who even needs that many pencils, am I right?
A gross equals 144
A gross refers to a group of 144 items (a dozen dozen or a square dozen).144 + 144 = 288288 + 144 = 432
Well, honey, a gross is 144 pencils. So, if each pencil costs 8 cents, then you just multiply 144 by 8 cents to get $11.52 for a gross of pencils. Hope that math lesson didn't cost you too much!
3 pencils for 1.65 implies that pencils are 1.65/3 = 0.55 each. Then 7 are 7*0.55 = 3.85