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11 answers

There are two options.

1) Convert to decimals first:
3.25 x 5.25

2) Break them down in simple fractions
Take the denominator and multiply it by the whole number, then add the numerator.
3 1/4 = (3 x 4) + 1 = 13/4
5 1/4 = (5 x 4) + 1 = 21/4

2007-09-06 19:30:46 · answer #1 · answered by stacichu7 3 · 0 0

some calculators will let you enter complex fractions directly but the faster way is to do some of this in your head then enter it.

It is easy:

3 1/ 4 is 4 * 3 + 1 over 4 = 13/4
5 1/4 is 4 * 5 + 1 over 4 = 21/4

Now enter 13 divided by 4 plus 21 divided by 4 equals
and you should get 8.5 for an answer.

2007-09-06 19:28:09 · answer #2 · answered by 037 G 6 · 0 0

You must convert the fractions to decimal first.

1/4=0.25 so
3 1/4 * 5 1/4 would be 3.25 * 5.25

Some calculators have a fraction button, and you can enter 3 1/4 * 5 1/4 directly, but most don't and you have to convert to decimal first.

2007-09-06 19:22:40 · answer #3 · answered by I don't think so 5 · 0 1

You can either type it in as "(3+1/4)x(5+1/4)" or make it into the equivalent decimal values 3.25x5.25.

Hope that helped.

2007-09-06 19:24:50 · answer #4 · answered by James 3 · 0 0

I would convert these numbers to mere fractions.

3 and 1/4 would become 13/4.
5 and 1/4 would become 21/4.

Then I would multiply and reduce.

2007-09-06 19:23:19 · answer #5 · answered by Matiego 3 · 0 1

[ ( ] [ 3 ] [ + ] [ 1 ] [ / ] [ 4 ] [ ) ] [ * ] [ ( ] [ 5 ] [ + ] [ 1 ] [ / ] [ 4 ] [ ) ] [ = ] will yield 17.0625
. . . or if you have a "mixed number key",
[ 3 ] [a b/c] [ 1 ] [a b/c] [ 4 ] [a b/c] [ * ] [ 5 ] [a b/c] [ 1 ] [a b/c] [ 4 ] [a b/c] [ = ] will yield 17 1 16

2007-09-06 19:50:24 · answer #6 · answered by Helmut 7 · 0 0

First, you should know that the decimal equivalent of ¼ is 0.25.

Therefore, 3.25 * 5.25 = 17.16

If you don't know the decimal equivalent, you deconstruct the problem:

1÷ 4 (=0.25) + 3 (=3.25)
* 1÷ 4 (=0.25) + 5 (= 5.25) = 17.16

2007-09-06 19:27:39 · answer #7 · answered by bedbye 6 · 0 0

What type of calculator are you using?

2007-09-06 19:36:45 · answer #8 · answered by kranberri1975 1 · 0 0

1 : 4 = 0.25 it is 3.25 and same with 5.25 and..........3.25 : 5.25 = 17.06

2007-09-06 19:28:21 · answer #9 · answered by Freesia 5 · 0 0

just press the keys...

2007-09-06 19:39:29 · answer #10 · answered by feebee!!!!! is back!!!! 4 · 0 0

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