![]() Would think about doing it, even if I was trying to do this in my head at the supermarket or something, I'd say, well, okay, See if you can figure it out on your own. So first here, we have 7.8 times 307, is approximately equal to what? When you see the squiggly equal sign, that means approximately equal to what. Step 8: It's pretty obvious by now that all we have to do now is add the new answers we have acquired. Your equation will look like this so far: Step 7: Again, you multiply the hundreds digit of the first numeral by the tens digit of the second numeral. This time you multiply the tens digit of the first numeral by the tens digit of the second numeral. Step 6: And the pattern starts all along again, but this time with the tens digit of the second numeral. Step 5: Now we come back to the units digit of the first numeral and multiply that by the tens digit of the first numeral. (Hot Tip: Write down a plus sign underneath the units digit of your new answer so far) You might be wondering about the tens digit in the second numeral because we haven't even used it once yet right?ĭon't worry I'll teach you in the next few steps: Your equation would look like this so far: All you have to do this time is multiply the hundreds digit of the first numeral by the units digit of the second numeral. Step 4: I guess you've caught the sequence by now. Step 3: You multiply the tens digit of the first numeral with the units digit of the second numeral. So far you've got 1 number under your equation, which is your answer so far) (So after step 2 the equation would be like: Step 2: You multiply the units digits in both numbers like so: (You might wonder what the dotted lines under the equation are for, it's for writing down the answer) Step 1: You jot down the numerals like so: 1 plus 3 is 4.I got this answer by using the normal algorithm method. And so we added it allįinding the combined area- the area of this plus theĪrea of that the area. The 6, we carried this 1 into the hundreds place. Multiplied the 2 times the 16, we just calculated Just doing that we justĬalculated that right over there. But notice we're really thinkingĪbout 20 times 60 is 120. So we're used to carrying theĢ down here and carrying the 1. So if you multiply 2 timesĪnd carry the 1. Said, oh, you know, I just throw a 0 down there. Into the tens place you've probably always So 7 times the 10 or theħ0, plus 7 times 6, the 42. So 112, what you justįigured out right over here, is this area Right over here. Sum of both of these things, because you're multiplying 7 The 7 times the 1, you really multiplyingĬarry it when you add this carried 4, and But right when youĭid that 7 times 6, we essentially calculated The 4 in the tens place because it's a 40. ![]() With the 7 in the ones place and you do 7 times 6 is 42. Hey, Sal, why did we go through all of this business? I've seen before Did I add that up right? Let's see, this will be 11. Tens is 9 tens, plus 4 tens, is 13 tens, which is the same Let's see, in the ones place, you get a 2. ![]() Going to be 200 plus 120 plus 70 plus 42. So what's the area of thisĮntire thing going to be? Well, it's going to be theĢ00 plus the 120 plus- let me do it this way- it's So it's going to be 7 timesĦ or 42 square units of area. And then finally, what's theĪrea of this little section right over here? It's 7 high and it's 6 wide. ![]() This purple, and I'll thrown some blue in there, too. Section right over here? Well, it's 7 high Now what's 20 times 6? Well 2 times 6 is 12, In there from the 20 to make it clear that this Not the color I wanted to use- let me use In your head 20 times 10 is just going to be. You could think of as 2 timesġ, and you have two 0's there. So we could figure out theĪreas of each of these sections, and then the area ofīe this product, is going to be the area of all Up by parts, because it'll be easier to compute, and weĬan see what part of the area those differentĬan think about what 10- so let me separate Is going to be 16 times 27, the area of thisĮntire rectangle. Right over here- and then the height of my rectangle, The product 16 times 27, what gives you the area ofĪ 16 by 27 rectangle. Point right over here, this line right over The 2 in the 10s place is representing 20. Which I want to do in that green color, the sixth, I've gone 10 slashes, or I'm representing 10 What's going on in the multiplication process.
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