A ratio shows how much of one thing there is compared to another. Ratios are usually written in the form a:b. If you are making orange squash and you mix one part orange to four parts water, then the ratio of orange to water will be 1:4 (1 to 4). The order in which a ratio is stated is important.
In our lessons this week, the children have been working hard on understanding what a ratio is and they have started to calculate ratios using a step by step guide:
Some children have even started looking at ratio problems to apply and develop their knowledge further.
We have also explored scale factor:
We use scale factor when we talk about increasing the size of a 2D shape. The size by which we make the shape larger is described by its scale factor. The children were given shapes where they needed to create the new shape, or they needed to work backwards using the measurements to calculate what the scale factor is.
Volume is the amount of space a 3D shape takes up. You can work out the volume of a shape by multiplying height × width × depth. If the shape is made of cubic cm blocks, you can count the cubes to find the shape's volume.
During this lesson, the children were given the challenge of finding different ways to create a volume of 64 cubic cm. This encouraged a lot of discussion between partners as they had to justify and explain their calculation to ensure it was correct.
This week, we have been applying our multiplication skills to calculate the area of rectangles, parallelograms, triangles and compound shapes.
Fractions, Decimals and Percentages
In maths, we have been looking at the equivalence of fractions, decimals and percentages. We have then taken this further to apply our division skills to help us find percentages of amounts using the following steps:
See if you can use these steps to find the answers to these questions:
After our hard work developing our place value skills, we are now working on applying this knowledge to addition and subtraction questions (up to 7-digits). The class have explored estimating before calculating an answer using rounding to ensure they know what their answer should be close to. We have looked at using resources, the bar model and the column method to calculate our answers.
As we have developed our fluency, we are now focusing on our reasoning and problem solving skills, relating to addition and subtraction. We have explored missing numbers problems, word problems and looking at finding different solutions to the same problem. The children have been working really hard at using sentence starters to explain their answers.
In maths this week, we have been focusing on subtracting using decimals and their measuring skills. The children worked together to accurately measure their height and their arm span, ensuring that they were using the measuring equipment precisely. They have then calculated the difference between their height and their arm span using column subtraction.