Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?
You can make a calculator count for you by any number you choose.
You can count by ones to reach 24. You can count by twos to reach
24. What else can you count by to reach 24?
Find the squares that Froggie skips onto to get to the pumpkin patch. She starts on 3 and finishes on 30, but she lands only on a square that has a number 3 more than the square she skips from.
A class of $30$ children were numbered from $1$ to $30$. Here
are some of the class:
Their teacher set out a ring of $6$ chairs.
Child number $1$ sat on the first chair, child
number $2$ on the second chair, child number $3$ on the third and
so on going round the circle, up to child number $6$. The teacher
then asked child number $7$ to stand behind child $1$, child $8$ to
stand behind number $2$ etc. They continued this pattern until all
the children were either sitting on a chair, or standing behind
How many people were standing behind each
Who was standing behind child number $3$?
What would happen if there were only $4$ chairs?