uPractice problems

We see that whole numbers are subtracted fromwhole numbers: fractions from fractions

Practice problems. Subtract the lower num-ber from the upper number and reduce thedifference to simplest terms

The following problem demonstratestraction of fractions in a practical situaXAMPLE: What is the length of the dimen-sion marked x on the machine bolt shown infigure 4-6(A)?SOLUTION: Total the lengths of the knownpart悉

Practice problem. Find the length ofdimension marked Y on the machine boltfigure 4-6(B).

MULTIPLICATIONThe fact that multiplication by a fraction doesnot Increase the value of the product may con-fuse those who remember the definition of mul.tiplication presented earlier for whole numbersIt was stated that 4(5)means 5 ia taken as anaddend 4 times. How is it then that 4)ie 2,anumber less than 47 Obvlously our idea ofmultiplication must be broadenedConsider the following products: