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Mental Strategies for Maths - Jump

Mental Strategies for Maths
Can you answer these sums, in your head, in 1 minute…
36+43=
18+64=
59-37=
48+46=
83-35
How did you go? Were you tempted to write them?
 
At Palmwoods State School, we work on strategies to help our students from Years 2-6 to be able to mentally calculate 2 digit numbers, without a need to write sums in the traditional algorithm.
There are three main strategies we are teaching to help students to do this.
1. Jump
2. Split
3. Compensate.
We teach the students that it doesn’t matter which strategy they use, as different ones work for different people and for different types of sums. The idea is to understand the different strategies and choose the one that works at the time!
 
Jump strategy – One number is kept unchanged. The other number is partitioned (broken up) and the parts are added on or subtracted. The adding or subtracting is done by “jumping” along a number line.
 
# Addition - 35+23 A student might think: 35, 45, 55, 56,57, 58 or 35, 55, 58
# Subtraction - 76-33 A student might think: 76, 66, 56, 46, 45, 44, 43 or 76, 46, 43
 
The Jump strategy can be represented with materials and visual models. In particular, hundred boards and empty number lines can be helpful in developing understanding.
 
 
How can I help at home?
* Play maths games that involve adding or subtracting eg. card or dice games for 1 and 2 digit numbers, add number Play maths games that involve adding or subtracting eg. card or dice games for 1 and 2 digit numbers, add number plates while driving, ask them to calculate amounts at the shops etc.
* Ask your child about the strategy they used to work out the sums and talk to them about the strategy you used.
* Compare your choices and note that any strategy is appropriate, as long as the answer is the same.
Happy Calculating! If you have any questions about this you can come along with your child to the Maths Club, every Friday morning 8am-8:30am in the Library. Teachers are on hand to answer questions and model strategies, with your child.