We covered a wide range of strategies for mental arithmetic during the lesson today which will allow you to be flexible and efficient when faced with different problems and tasks. Now it is time to put your knowledge to the test! Remember to read all questions carefully.

Which of the following methods for answering a multiplication questions is NOT a mental strategy?

Today we discussed distributive law in relation to multiplication. But which of the following number sentences does NOT correctly represent distributive law?

Which of the following representations would be efficient for the calculation 317 x 23?

For which of these calculations would you consider using a mental strategy and NOT a written method?

Which calculation do the dienes represent?

Using Derived Facts to Multiply Mentally Quiz

What a super learner you are! Being able to estimate and calculate within the same lesson, you deserve a big pat on the back for a job well done! However, our lessons are never over until you have completed the quiz. This will be a great opportunity to see how much of the information has embedded and how confident you will be to calculate flexibly in the future. Good luck.

Which of the following number sentences would be the most efficient choice to use when estimating 237 x 4

Which estimation is correct for the calculation 192 ÷ 8?

I rounded a calculation and got the estimated answer of 560. But what was my original sum?

Which of the following calculations would provide you with the value indicated on the marked number line after it is rounded to create an estimated answer?

Calculating Flexibly Quiz

In this lesson, we will learn to estimate using derived facts and then adjust them to calculate the answer. We will then be able to solve a range of problems selecting suitable strategies and giving reasons for our choices.

Maths

Y5 Maths

Key Stage 2

Year 5

Calculating flexibly

Multiplication and division

Number

THEME

UNIT

Multiples and factors

Factor pairs

Prime numbers

Factor and multiple chains

Multiplying and dividing by 10, 100, 1000

Doubling and halving strategies

Using derived facts to multiply mentally

Short multiplication

Long multiplication

Using factors to multiply

Using multiples to divide

Short division

Division with remainders

Consolidation and Review

1 is not a prime number because...

Can you find the mystery number? It is less than 50, 6 and 12 are both factors of it and it is a multiple of 9.

Lucy created four different alternating factor and multiple chains. Her partner, Yasin, has spotted a mistake in one of her chains - can you tell which one?

Which of the facts can I derive from the representation below?

Which derived fact helps me to mentally solve                         240 ÷ 5?

Using your knowledge of inverse, which of the following numbers is not a factor of 248?

45 is a factor of 360 because.....

Which statement below is false about the calculation 2536 ÷ 4 = 634

In the image below, you can see the first 3 squared numbers. What would the  6th squared number be in the sequence?

Lesson overview:Calculating flexibly

Core Content

Multiplication and division: