Module 1 Counting and understanding number
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Can I round whole numbers to 1000 to the nearest 10 or 100?

Example review questions

  • Can you:
    • suggest a number that rounds to 60 when rounded to the nearest 10?
    • explain how you round 676 to the nearest 10?
    • explain how you round 249 to the nearest 100?
    • round 251, 243 and 245 to the nearest 10?
    • round the same three numbers to the nearest hundred?
  • Which multiples of 10 lie between 300 and 400? Which of these is 316 closest to?
  • Say the multiples of 100 between 0 and 1000. Which of these is 753 closest to? How do you know?
  • A number rounded to the nearest ten is 540. What is the smallest possible number it could be?

Teaching guidance

This teaching guidance document suggests some of the key vocabulary, models, images and practical equipment that children should experience and be able to use. It also includes some teaching tips to provide a few starting points for ways of supporting children with this area of mathematics.

DOC file Can I round whole numbers to 1000 to the nearest 10 or 100? - teaching guidance | 201KB new window

Consolidation and practice

These resources are to support children in guided or independent work. Roll over the highlighted resources for a description.

PDF file How to use decimal number line ITP | 128KB new window

SWF file Decimal number line ITP | 37KB new window

PDF file How to use measuring scales ITP | 151KB new window

SWF file Measuring scales ITP | 67KB new window

PDF file How to use measuring cylinder ITP | 171KB new window

SWF file Measuring cylinder ITP | 50KB new window

PDF file How to use number line ITP | 128KB new window

SWF file Number line ITP | 48KB new window

XLS file Rounding | 59KB new window

DOC file Rounding guide | 103KB new window

Decimal number line

itp_decimal_number_line.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of place value within whole and decimal numbers. Decimal number line ITP allows the child or teacher to select an interval from a given number line and show that interval divided into ten equal parts but on a bigger scale, which can then be repeated.

Measuring scales

itp_measuring_scales.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of number, measures and problem solving. Measuring scales ITP allows the child or teacher to add different masses of 1, 2, 5, 10, 50, 100 and 500 units to a scale pan. The scale intervals can be changed to challenge children to interpret different scales.

Measuring cylinder

itp_measuring_cylinder.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of number, measures and problem solving. Measuring cylinder ITP allows the child or teacher to simulate varying intervals on a scale, pouring liquid into the cylinder and interpreting the scale. The ITP can be used to explore and consolidate the interpretation and reading of scales, mental calculation strategies and methods of recording.

Number line

itp_number_line.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of number. Number line ITP allows the child or teacher to display a range of numbers from minus 50 up to 500. Children can estimate a number on the number line, explore the concept of difference between two given numbers and demonstrate their calculation strategies.

PDF file Springboard 3, Unit 10 Reading scales | 172KB new window

DOC file Can I round two-digit or three-digit numbers to the nearest 100? | 132KB new window

DOC file Can I round two-digit or three-digit numbers to the nearest 10? | 34KB new window

Opportunities to use and apply

Possible contexts include:

  • approximation in calculation, e.g. 378 − 83, what is the approximate answer?
  • addition and subtraction involving rounding and adjusting, e.g. Children find 52 + 29 by calculating 52 + 30 then subtracting 1.
  • money and measures, e.g. What is 275p rounded to the nearest pound? What is 845 cm rounded to the nearest metre?
  • reading scales to the nearest numbered interval, e.g. What is the weight shown on these scales (to the nearest
    100 g)?
    Weighing scales showing a weight of 340 grammes.

Confirming learning

Ask probing questions such as:

  • What tips would you give to someone who is learning how to round numbers to the nearest 10 or 100?
  • The local newspaper said that 800 people attended a concert. This was given to the nearest 100. What is the smallest possible number of people who attended? What is the largest possible number?
  • Round 348 and 352 to the nearest 100. Why do they round to different numbers?
  • A number is rounded to the nearest 10. The answer is 720. How many different possible start numbers are there? What are they?
  • Round 296 to the nearest 10. Round it to the nearest 100. What do you notice? Can you suggest another number like this?