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45/100
45/1000 or 9/200
45 billion, 672 million, 345 thousand, 618
You need a miter saw. It has a back gauge to butt the wood up to, and then the saw has holders to keep it from wobbling. You can set the angle. It may just have notches for 90 degrees and 45, or it may have a protractor on it.
45 x 10,000 is 450,000 which, in standard form, is: 4.5 x 10^5