Aprendiendo a dividir entre dos y tres cifras

Aprendiendo a dividir entre dos y tres cifras


We will see how to make a division between a number formed by 2 or 3 digits let us begin divide 8956 between 42 we wrote there the division and we are going to calculate it first you have to take the first
two numbers here and see if it’s higher that the outside number in this case 89 yes it is
greater than 42 now you have to calculate the 42 how many times does it fit in 89 more or less for this we can fix ourselves if we want
in the first figure here and in the first figure here and it is easier to calculate how many times the 4 fits in the 8, it fits 2 then we calculate that more or less 42 also fits about twice in the 89 this works most of the time, sometimes it will be necessary to make some correction, but most of the time we can take the first number here and the first one here, and make the division as if it were a single number We write here a 2, multiply 42 by 2 2×2=4, we put it below 9; 4×2=8, we put it below 8 there we have the multiplication and now we are going to subtract 89 – 84 9 – 4=5; 8 – 8=0 We do not write the zero. We can write it but it does not matter if we do not put it. Now we go down 5 How many times does 42 fit in 55? Here it is easier to see that it only fits once 2×1=2, 4×1=4, we do the subtraction again 5 – 2=3, 5 – 4=1 And we went down 6 How many times does 42 fit in the 136 ?, again it can be a bit complicated to see, but we take the 4 here and the 13 here If they are fixed we are only removing the last digit to more or less calculate And how many times does 4 fit in 13? it’s easier to see that it fits 3 times Then again we multiply: 2×3=6, 4×3=12 We do subtraction, 6 – 6=0, 3 – 2=1 and there would end the division (with integers) same if we want to continue it we can
put a decimal point and a zero here And again, how many times does 42 fit in 100? We look at how many times fits 4 in 10, fits twice We do the multiplication, 2×2=4, 4×2=8 Now we subtract: here is a zero, and 0 – 4 can not be done so we take it as a 10, 10 – 4=6 But as we take this as a 10 we have to add 1 here so that we have 9 and again we take this as a 10 10 – 9=1 add 1 here and 1 – 1=0 and there we can leave the division or re-add a zero and continue it I’ll leave it here Now let’s make a division with a
three-digit number, is very similar to the one we just saw We look at the first three figures from here, if they are larger than the ones from here, then we start the division and without it, we take the next one In this case 154 if it reaches to fit in this To see how many times we can do as in the previous exercise, stop looking at the last digit How many times does 15 fit in 63? It fits about 4 times since 15×4=60 We put a 4 of that fits 4 times, we multiply 4×4=16, we put 6 and we carry 1 5×4=20, and one that we carry is 21, we put 1 we carry 2 1×4=4, plus two that we carry is 6 We do the subtraction: 8 – 6=2, 3 – 1=2, We go down the next 2 How many times can 154 be in 222? One time, it can not fit 2 4×1=4, 5×1=5, 1×1=1 We do the subtraction 4 for 12 … 12 – 4=8 We add 1 to be 6, 12 – 6=6, we add 1 to be 2, 2 – 2=0 we no longer put it and there the division ends (with integers) same as the previous case we can
add a decimal point and a zero here 154 in 680 how many times it fits, it’s like here, it fits about 4 times we do the multiplication and it will give us the same as here 4×4=16, we put 6 we have 1, 5×4=20, and one is 21, we put 1 we have 2, 1×4=4 and 2 is 6 Now we subtract 10 – 6=4, 8 – 2=6, 6 – 6=0 and we no longer put it There we can leave the division or add another zero and continue, here it fits 4, we do the multiplication 4×4=16, 6 we have 1, 5×4=20 and 1 is 21, 1×4=4 and 2 is 6 We do the subtraction: 10 – 6=4, 4 – 2=2, 6 – 6=0 We can again add a zero and continue as we want The more times we do it, the more precise the result, the more accurate but sometimes we never go to
finish doing it, and other times we will reach a time where we are exactly zero I hope the idea was clear to you, and having seen this Try to make the following divisions and in a later video I will put the answers