TRY TH $Chab$ the divisibility of the following numbers by 3. $4$ $432$ 1. 108 2. 616 3. $294$ EXERCISE $1.2$ of 9, where y is a digit, what is the value ofy? 2. $1f31=5i5$ a multiple of 9, where z is a digit, what is the value of z? $2$ $5$ 1. $1121y5$ is a multiple You will find that there are hwo answers for the last problem. Why is thi 3. $1f24xisan$ multiple of 3, wherex is a digit, what is the value ofx? $\left(since24xis$ a multiple of 3, its sum of digits $6+x15$ a multiple $13:s0s$ 6+ of these numbers: $s:0.3.6.9.12.15.18$ ... .But sincex is a digit, it can $6+x=6or9$ or 12 or 15. Therefore, $x=0$ $or3$ $0r6$ or 9. Thus, xcan ha four different values.) 4. $1f31=5isam$ multiple of 3, where z is a digit, what might be the values of SSED? DICCU

EXERCISE $1.2$ 1. $1f21y5$ is a multiple of 9, where y is a digit, what is the value of y? 2. $1f31z5isa$ multiple of 9, where z is a digit, what is the value of $2$ You will find that there are two answers for the last problem. Whvise 3. $1f24xisa$ multiple $0f3$ where.x is a digit, what is the value of r2 $nce24xisa$ multiple $0f3$ its sum of digits $6+xi^{.sa}$ multiple of 3 $\left(Sinc6$ $s:0,3,6,9,12,15,18,$ .But since x is a digit, it ca of these numbers: $6+x=6or9or12or$ $15$ Therefore, $x=0or3or6or9$ Thus, ca $es\right)$ $foMn$ different values.) 4. $1f31z5isa$ $0le0t3,$ where z is a digit, what might be the values

$1.$ $1f21y5is$ a multiple of 9, where y is a digit, what is the value of y? 2. $1t31z5$ is a multiple of 9, where z is a digit, what is the value of z? $0mblcm$ Why is this $s07$ You will find that there are two answers for the last 3. $1f24xis$ a multiple of 3, wherex is a digit, what is the value of x? $\left(Since$ $nce24xisan$ multiple of 3, its sum of digits $6+xisam$ multiple $of3:s06+xis0nd$ of $4hese$ numbers: $0,3,6,9,12,15,18$ ... .But since x is a digit, it can only be that $6+x=6or9or$ 12 or $15$ Therefore, $x=0or30F$ 6 or 9. Thus,r $xcan$ have any of four different values.) $4$ $If31z5isam$ multiple of 3, where z is a digit, what might be the values of z?