Summer, 2017
I happen to be the happy father of a proud 8 year old.
$4 \times 23=?$
Looks like we used the
We also used
If $a=b$, then $P(a)=P(b)$
$23=20+3$, so $4 \times 23 = 4 \times (20+3)$.
$3\times(2+4)$ $=$ $3\times2+3\times4$
How about:
\begin{align} 4 \times 23 &= 4 \times (25-2) \\ &= (4\times25)-(4\times2) \\ &= 100-8=92 \end{align}$4\times(2x+3)=?$
Note how similar this is to the last question.
In fact, if $x=10$, this is the last question.