Long multiplication

Maths

Multiplication and division

What calculation is represented by the dienes shown below?

What four products are missing from the area model shown?

What calculations do the dienes represent below?

Using your knowledge of multiplying with multiples of ten, can you identify the correct answer for 29 x 21?

Abdul thinks the person has multiplied by 3 incorrectly.

Lucy believes the regrouping has been incorrect on two occasions.

Safin believes the columns have been added incorrectly so the total is wrong.

Simon thinks the person has not used a place value holder.

Look at the calculation carefully. There is an error but the pupils can't decide where! Which pupil is right?

What calculation is represented by the area model?

When trying to estimate 153 x 4, which derived number fact is important to know?

When calculating 313 x 4, which estimation would be most efficient?

It is impossible to make mistakes using short multiplication

Mental strategies work better only on rounded numbers

The question requires a lot of regrouping which can make mental strategies less efficient and effective.

Summer turned to page one of her maths test and saw the question was 2534 x 6. Last week they were taught both mental strategies and formal written methods and is unsure which one to use. Why would the formal written method be better to use for this question?

Daniel has not made a mistake, the teacher has marked it wrong incorrectly.

Daniel completed his work in class but when it was marked, he found he had  got the following question wrong. He is confused as he is sure he is right and the teacher is wrong! But if he has made a mistake, where is it?

This lesson will soon be taken down.

Long multiplication

Lesson outcome