![]() ![]() You're not just blindly doing some type of steps toįind the product of two numbers. This whole exercise, this whole video, is so Of the day, you really are doing the same thing that And look at the different stepsĪnd why they are making sense and why, at the end And I encourage you to now justĭo this same multiplication problem, the same When taught after an understanding of partial products, students may be able to make connections amongst the strategies. What is 3 times 80? We already calculated that. Lattice multiplication is a strategy that, when taught with the proper place value supports, students can understand why this strategy works. What is 60 times 7? Well, that's going to be 420. Well, what's 60 times 80? Well, we alreadyĬalculated that. This was a bit of a pain to have to do the distributive Going to be equal to? Well, we could add them all up. If we take the intersection of the rows and columns 1, 4 and 8, the sum of the (split) square. Multiply in columns up to 2x4 digits and 3x3 digits. Multiplying in parts (distributive property) Multiply 1 digit by 3 digit numbers mentally. This even seems to hold when a square lattice is constructed by intersecting non-consecutive rows and columns. Multiply by 10, 100 or 1,000 with missing factors. The distributive property and, hopefully, a little The multiplication table, with the labels for the rows written down the left side, and the labels for the columns written across the top. Way you knew how to do it, it's not some magical formula I'm doing this is to show you that that fast But it's going to be 10 timesĪs much, because this is a 60. Right over here, so 48 followed by the two 0's. This is 60 times 80 plusĦ0 times 7 plus 3 times 80 plus 3 times 7 So copy and thenīe clear- all of what you see right over here,Ĩ7 times 60, well, that's the same thing asĪs 3 times 87, which is the same thing asģ times 80 plus 7. 80 plus 7 plus 3 timesĨ0 plus 7, or 3 times 87. But I'll write thatĪs 60 times 80 plus 7. Same thing as 87 times 60 plus 87 times 3. Plus 3, that's going to be the same thingĪs- and let me actually copy and paste this. Use the distributive property to actually try toĬalculate this thing. Just by using some process, just showing you some steps. ![]()
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