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As a guide in England pupils begin learning the multiplication tables in year 2 (6 years old), they are expected to have them memorised completely by the end of year 4 (8 years old). However each child is different and some may begin earlier or later. Obviously the app is useful for any person who never learnt the multiplication tables thoroughly, whatever their age.
The current pedagogical thinking is that it is more logical to learn the tables in groups. For example in England pupils learn 2× 5× and 10× first. The app splits the tables into four carefully selected groups. The first set is relatively easy 1× 2× 5× , the second set 3× 4× 10× . This means that studying the 4× they will see some of the same values as the 2×, the 10× is quite easy. So at the halfway stage they will have tackled the easier sets but have also gained the confidence to take on the harder groups. Further since multiplication is commutative they will have already learned some of the answers. For example having learnt 4×7=28 they will already know what 7×4 is. The last two groups are 6× 7× 8× and 9× 11× 12×
There are a few ways you can help your child learn the multiplication tables. The most important thing is to provide support, encouragement and take an active interest. An idea would be to promise a reward for each cup they have been awarded in the app.
Also help your child by asking the questions orally, this can be done by using the flashcards screen and ask your child to give the answer to each multiplication or division.
There has been some debate about whether children need to memorise all the table values. The main criticism is that simply memorising the answers without understanding is not beneficial. The difference here is the app is using the bar system, so the child not only remembers the values but also gains a deeper understanding of the concepts involved. For example gaining an understanding that multiplication is commutative, they can see that 3×4 is the same as 4×3 on the number line. Likewise practice on the app makes it easy to understand the relationship between multiplication and division. Research also shows that when a child knows the multiplication values it means they can devote more brain power to the rest of the math problem they are tackling.