Use the information to describe these marbles. What colours must
be on marbles that sparkle when rolling but are dark inside?
This problem looks at how one example of your choice can show
something about the general structure of multiplication. This
ladybird is taking a walk round a triangle. Can you see how much
he has turned when he gets back to where he started? More than
$30$ solutions were sent in but the activity had asked for some
kind of proof and many solutions unfortunately consisted of
examples of numbers only, so here are the ones that said a bit
more. Firstly Amrit from Newton Farm Nursery, Infant and Junior
School in the United Kingdom who wrote; Every odd number can be
written in the form $2a + 1$, so let the two odd numbers be $2a
+ 1$ and $2b + 1$. Thus their sum is $2(a + b + 1)$. As every
even number can be written in the form $2n$, the sum of two odd
numbers is always even. From James from St. Johns School in
Northwood, England we had; They always add up to an even number
because if you ad