Mental numbers
Today Múinteor Ray taught us about mental maths. That is maths that we do without using pens or pencils.
Activity 1: Guess My Number Game This is one of Múinteor Ray's favourite game! It’s really fun to play, especially with other people.
In his Mental Maths lesson, Múinteoir Ray picked a number in his head from 1 – 100 using the number square below.
NUMBER SQUARE
Activity 1
Guess My Number Game
A)
Let's see if you can figure out what the number is using the following clues:
The number is less than 60
The number is even
It's more than 40
It is next to 57
It is one less than 57
Can you guess what the number is? Try these ones too...
B)
The number is less than 50
The number is odd
It's more than 30
It comes after 36
It is one less than 38
C)
The number is less than 90
The number is odd
It's more than 85
It comes after 91
It comes before 94
D)
The number is less than 28
The number is even
It's more than 21
It comes after 24
It comes before 27
E)
The number is less than 75
The number is odd
It’s more than 70
It comes after 72
It comes before 74
ALL THE ANSWERS ARE HERE - JUST CLICK ON THE LINK!
Now ask a friend or adult to pick out a number between 1 and 100 and see if you can guess it by asking similar questions!
Activity 2
The Hungry Hedgehog
Lead the hungry hedgehog on the next page to the fruit by moving one square at a time! This is really cool.
By adding 6 to a number, we can follow a path through the maze. So starting at Square 1, we add 6, to get 7. This means we can move one space to Square 7!
Where do we go from Square 7? Do we go to Square 11 or Square 12 If we add 6 again, this time to 7, and we get 13. So the hedgehog moves one space to Square 13 Now it is your turn.
We need to add 6 to 13 to see what square we move to next. If we look at the maze, it can't be Square 5 or Square 27. 6 + 13 = 19!
So let’s mark Square 19 and let’s find that fruit!
