Question
$24 \times 35 = 24 \times 18 + 24 \times $_______
✓
Answer
Let a be the missing number,
then $24 \times 35 = 24 \times 18 + 24 \times a $
$\Rightarrow 24 \times 35 - 24 \times 18 = 24 \times a $
$\Rightarrow 24(35 - 18) = 24 \times a $
$\Rightarrow 24 \times 17 = 24 \times a$
$\therefore a = 17$
then $24 \times 35 = 24 \times 18 + 24 \times a $
$\Rightarrow 24 \times 35 - 24 \times 18 = 24 \times a $
$\Rightarrow 24(35 - 18) = 24 \times a $
$\Rightarrow 24 \times 17 = 24 \times a$
$\therefore a = 17$
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