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Why Mental Maths is SO Important! 2

2. What is Mental Maths?
Doing a calculation in your head without using a pencil, paper, or calculator!

3. Where should we be doing Mental Maths?
At school (of course)
At home
In the car
At the shops
With our friends
EVERYWHERE!!!!

4. But I have a calculator! So what!
Mental maths is about discovering strategies
Its about figuring out how numbers work together
Learning about how different maths functions are related to each other.
It is the building block upon which all other mathematics is built.

5. Mental Maths build up – Addition and subtraction
First you learn to add
Then you get repeated addition (multiplication) and repeated subtraction (division)
Fractions
Factors and prime factorising
Ratios
Substitution
Algebra
Exponents….

6. Great, no pressure!
Mental maths is only the key to unlock the door to understanding mathematics!

7. So, what can we do to make Mental maths fun?

8. Mental Maths Games Calculator Mental Maths The mental maths race
Last man standing
Repeated addition (number patterns / multiplying)
Repeated subtraction
Random numbers games
Discovering 10s, 100s and 1000s
Snap-Factors

9. The Mental Maths Race On your calculator: Press Math Drill Question?25
◄ + ‒ x ÷ + ‒ x ÷ ►
SELECT & [ENTER]
On your calculator:
Press

10. Last Man Standing Using drill Mode All students stand and close eyes
Give suggested answers
It helps to have an emulator.

11. Repeated Addition and Subtraction
ANS + 7=
101.
Press
Choose
Pick a number to start with
Press OR
Enter the number to add.
Press and same number
Keep pressing

12. Random Number Games To get to Random:
0: RAND 1: R-DICE
2: R-COIN 3: R-INT
To get to Random:
Press
Choose 1 option by pressing the corresponding number.
Multiples of, counting in, factors of, multiply
Anything you like!

13. Discovering 10s, 100s and 1000s
81 x 10 =
810.
You can make it as advanced or as complicated as you like
Type in any number, eg. 81
Press
And type in 10,
Now press
Add another
And see what happens to your answer

14. Snap-Factors SNAP! Using the random function.
RANDOM x 10 =
Using the random function.
Pair children in groups from 2 to about 4
One child in the group is the big number: He/She chooses R-INT (3)
The other children are the factors: They can choose R-DICE (1) or RAND x 10 (or 20)
If a factor belongs with the big number, the first student to say snap gets a point.
First student to 10 points is the reigning snap-factor master!
SNAP!
R.INT =
99.

15. Three other handy things teachers should know
×55=
68 3 4
Class marks:
Press
Type in converting to at the top
Type in converting from at the bottom
Type in first student’s mark and
Then type in next students mark
and
Repeat

16. Class Averages Press then
𝑥 =
48.2
Press
then
Type in all your students marks by typing in a mark and then pressing
When done, press
To get average press

17. Multiples of Numbers Bigger than 12
X ANS
0 0
1 17
Press
Type in the number
Press times.
Scroll up and down the table using and

18. Thank you! For free worksheets visit: www.e-classroom.co.za
For other maths resources: