My calculator does not have a 3 key that works! How can I use this broken calculator to do 23 x 45.

Question

asked Jul 2, 2023 197k views

1 Answer

Biscuitstack · Answer 1 · 2023-07-07T21:07:40+0000

$\longrightarrow$ This problem can be tackled by using distributive property of multiplication .

It states for any three numbers a,b and c

$\green{ \underline { \boxed{ \sf{(a±b)* c = a * c±b* c}}}}$

Similarly,

$\quad$ 23 × 45

$\longrightarrow$ (21+2) ×45

$\longrightarrow$ 21×45+2×45

$\longrightarrow$ 945 + 90

$\longrightarrow$ 1035

It can also be done as-

$\quad$ 23 × 45

$\longrightarrow$ (25-2) ×45

$\longrightarrow$ 25×45-2×45

$\longrightarrow$ 1125-90

$\longrightarrow$ 1035