To change a number into another number that is approximately the same value but is easier to work with. E.g. round 561 to the nearest 10 is 560.

Checking understanding of rounding

Maths

Securing understanding of rounding

Rounding to three decimal places

Rounding to any number of decimal places

Rounding integers to one significant figure

Rounding integers to significant figures

Rounding decimals to significant figures

Degrees of accuracy

Estimating numerical calculations

Checking by estimating

Truncating

Overestimating vs underestimating

Rounding errors

Inequality notation to express error

Using inequality notation for errors in calculations

Problem solving with estimation and rounding

In this unit, pupils have learnt how to round to a given number of decimal places or significant figures and explored the effect of using rounded numbers for calculations. In the future unit, pupils will investigate the bounds and perform calculations to determine a best/worst case scenario.

The prior unit on place value allowed pupils to develop the skills needed to estimate and round values. By understanding the value of each digit, pupils can determine what other values are close to the original value. This unit continues the exploration of the infinite nature of sets of numbers.

This unit helps pupils understand rounding to different decimal places, and significant figures. Pupils will also learn how to truncate numbers and understand the contexts in which these skills are useful. The unit ends will an exploration of rounding and inequality errors.

Estimation and rounding

Rounding means to change a number into another number that is {{ }} the same value but is easier to work with.

13 745 rounded to the nearest thousand is {{}}.

Lucas buys a t-shirt costing £14.75.  What is the cost of the t-shirt to the nearest pound?

Jun writes 378 as approximately 400.  Jun has written it to the {{ }} hundred.

Which digit is in the thousands column in 43 978? {{}}

Which digit is in the tens column in 3492? {{}}

In the number 57.392, which column is the 3 in? 

In the number 57.392, which column is the 2 in?

The number that is halfway between 3 and 4 is {{}}

Checking understanding of rounding

Lesson outcome