Exercise 3.2 - Chapter 3 - Patterns - Term 1 - 4th Maths Guide Samacheer Kalvi Solutions

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Ex $3.2$
Question $1 .$
Circle the multiples of 9 (by using casting out nine)
(a) 9443
(b) 1008
(c) 24689
(d) 23769
(e) 13476
Answer:
(a) 9443
$=9443$
$=\overline{4}+4+3=11$
$=9-11$
$=2$ (no)
(b) 1008
$=\underline{100} \underline{8}$
$1+8=9$
$9-9=0$ (multiple of 9 )
(c) 24689
$=2468 \underline{9}$
$=2+4+6+8=20$
$20=2+0=2$ (no)
(d) 23769
23769
$7+2=9$
$6+3=9$
$9-9=0($ multiple of 9$)$

$\begin{aligned}
&\text { (e) } 13476 \\
&=1 \underline{3} 47 \underline{6} \\
&1+4+7=12 \\
&1+2=3 \text { (no) }
\end{aligned}$
 

Question $2 .$
Circle the correct addition fact (by using casting out nine).
(a) $4355+5369=9724$
(b) $7632+2213=9845$
(c) $6023+3203=9220$
(d) $2436+5315=7701$
Answer:
$\begin{aligned}
&\text { (b) } 7632+2213=9845 \\
&=\underline{7632}+2213=\underline{9845} \\
&0+8=8 \\
&8=8
\end{aligned}$
 

Question $3 .$
Circle the correct subtraction fact (by using casting out nine).
(a) $7420-3625=3795$
(b) $2362-632=1720$
(c) $6732-4361=2371$
(d) $3264-1063=2200$
Answer:
(a) $7420-3625=3795$
$7420-3625=3725$
$4-7=15$
$4=15+7$
$4-6+7$
$4=13$
$4=4$

(c) $6732-4361=2371$
$6732-4 \underline{361}=2371$
$9-5=13$
$4=4$