You can multiply 2 digit and 3 digit numbers in a variety of ways. This strategy is very efficient, but requires careful attention and an understanding of each step.
Please use the following pictures for your reference:
Now try the following questions:
1) 34 x 68
2) 79 x 26
3) 432 x 956
4) 157 x 520
Is it possible to use the cross multiplication strategy for the following question? If so, how? If not, why?
97 x 145
1. 2312
2. 2054
3. 687992
4.36140
5. It doesn’t work because I tried and compared the answer to the real answer (real answer is 13630)answer I got was. 10765).
Yes, but how did you multiply it??
1.2312
2.1914
3.412,992
4.81040
Ms .Haskins how do you multiply the #’s
Elorina, are you asking about questions 1-4 or about question 5?
1. 2,312
2. 1,976
3. 412,992
4. 81,640
You can’t really multiply 97 x 145 because if you multiply 7 x 5 = 35 and then if you multiply 9 x 5= 45 then you’ll probably have to multiply 7 x 14 = 98 but then you’ll end up with a different answer if you add it all up it will be 136,285 but if you’ll check a calculator to see if your answer is correct and it will say 14, 065 then you’ll probably just get confused on what you’re going to do to find the correct answer.
Hi, me and a couple different students have been wondering whether or not this is the math we were assigned.
1.)
34 x 68 = 2,312
2.)
79 x 26 = 2,054
3.)
412,992
4.)
81,640
5(?).)
14,065
A piece of paper will be handed in tomorrow, explaining how I got these answers.
Yes, this is it.
wait.. are we supposed to show our work on a paper or something?
I trust that you have used the requested strategy/method. You are welcome to bring the paper you wrote on into class tomorrow, but if you’re feeling confident, there’s no need.
My answers are the following:
1: 2,312
2: 2,054
3: 412,992
4: 81,640
5: You could just add one zero by the left of the nine and do
the cross multiplication with the zero there.
1. 2312
2. 2054
3. 412 992
4. 81 640
5. I think you cannot multiply 97 and 145 since the numbers do not have the same amount of digits.
Mrs. Haskins, I am going to do #1-4 on a different sheet of paper if that is okay with you.
5. Yes it is possible, you just have to put a 0 before the 97 like so:
145
X097
I agree with you.
1) 34 x 68 = 2312
2) 79 x 26 = 2054
3) 432 x 956 = 412992
4) 157 x 520 = 81640
It is not possible because without that missing place value with the 97, you will be missing a step in the procedure.
1. 2312 2 .2054 3. 4236992 4. 81640
The answer is no because if a number does not have the same amount of numbers as the other one it will mess up the process
1. 2312
2. 2054
3. 412992
4. 81640
I think it IS possible, because all you have to do is add a 0 before the 9.
Example:
145 times 097
(sorry I don’t have the multiplication sign)
– Sophie
2312
2054
412992
81640
Yes you can do it . I just added a zero in the hundred’s place and became a 3 digit number.
Hi, my answers are?
1. 2312
2. 2054
3. 412992
4. 81640
5. I think you cannot multiply them because they have a different amount of digits. 97 and 145 since the numbers do not have the same amount of digits it would not work if we take away a dight from 145 for eg 45 we actually can do it.
1.2312
2.2054
3.412992
4.81640
I think 97 x 145 can’t be multiplied because it would be necessary on the cross multiplication be like this : If was of 2 digits was all 2 digits up and down and if was 3 digits the same thing as 2 digits but with 3 digits