spacerGo to home page
Go to Home Page Home > iMath Whiteboard > Measures
Choose the topic:

P: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Link to the activity
Area of a triangle
Angles of a triangle
Measuring angles
Measuring length
Isosceles triangles
Right-angled triangles

P1: Triangles

An interactive resource which enables the user to create triangles.
Use this resource for:
area of a triangle, angles of a triangle, measuring angles, measuring length, coordinates, isosceles triangles, right-angled triangles, Pythagoras' Theorem, Trig.
Best viewed in full-screen mode: if you are using Internet Explorer press F11

The buttons (numbered top to bottom)
Buttons1. Show/hide the area
2. Show/hide the length of each side
3. Show or hide the size of each angle
4. Snap to a grid
(mm, 5mm or 1cm)
5. Stick to a line: the point will try to stick to aline when dragged.

More buttons1. Coordinates and labels, click once to show labels, again to show coordinates, again to hide coordinates.
2. Show/hide axes
3. show/hide protractor

4. Show/hide ruler

5. Show hide/rectangle

6. Show/hide cm grid

7. Show/hide mm grid

Protractor buttonsIf the protractor or ruler are shown then an extra set of buttons is shown:
1. Rotate ruler or protractor clockwise
2. Rotate ruler or protractor anti-clockwise

3. Rotate 90 degrees

4. Zoom (protractor only)

The protractor and ruler can both be dragged about.

Length, angle, mass and capacity
link to Measure Length 1
link to measuring each side of a quadrilateral

Measuring length with a ruler

P2: Measure the length of each of three lines. Drag the ruler into position.

P3: Measure the length of each side of a quadrilateral. A quadrilateral is randomly generated; keep clicking until you are happy with the quadrilateral. Drag the ruler to measure one side of the quadrilateral. Use the rotate buttons to line up the ruler and the side. Use the zoom button to zoom in or out. The quadrilateral can be moved by dragging the top left corner.




Link to the activity
A screenshot of the activity




Show/hide protractor, rotate buttons
Show/hide protractor
Rotate buttons
Rotate the angle, zoom button
Rotate the angle Zoom button

Estimate, draw and measure angles

P4: Target Angle
Use this resource for estimating and measuring angles up to 180 degrees.

The angle slider A target angle is generated randomly. Can you make the target angle?
First use the slider to construct the angle.
Click the 'OK' to have your angle measured.
Information about your angle is given.
Click the 'next' button for another angle or click 'start again' to reset your scores.


P5: Place in order of size a set of angles each less than 180 degrees.

P6: Acute or obtuse and estimating angles to the nearest 5 degrees.

Measuring an angle

P7: Measure an angle. An angle is randomly generated; keep clicking until you are happy with the angle. The angle can be estimated or measured. Move the angle by dragging its 'corner'. Reveal the protractor and move it into position then rotate it to fit over the angle. The angle can also be rotated.

Link to measuring length
Link to activity
Link to measuring cylinders Link to activity

SAT-type questions

P8: Measuring length with a ruler
What is the total width/length of the three shapes? What is the width of the hexagon? ...the rectangle? Work out the widths then drag the ruler to measure the individual shapes.


P9: How much sugar?
Read the combined weight of flour and sugar and the weight of just the flour from the scales.
How much does the sugar weigh?

P10: How much sugar? Part 2
As above but the scales show the weight in grammes and ounces. The scale is horizontal.



P11: Liquid in 1000 ml measuring cylinders
How much liquid is in each measuring cylinder? Measure to the nearest 10ml.

P12: Estimate how much liquid is left
Estimate how much is left in a 1 litre jug.

Area and perimeter
Link to the activity
Link to the activity

Link to area worksheet

Area and Perimeter

P13: Area and perimeter of rectangles

P14: Work out the shaded area

P15: Area of triangles on square dotty paper.

P16: Area of parallelograms and trapezia on square dotty paper.
Could be used just to differentiate between a parallelogram and a trapezium.


Mental arithmetic
Examples of time questions

Mental arithmetic 'tests' comprising ten questions on money and time.

P17: Money

P18: Time

Read the time from clocks and timetables
Link to activity
Four clocks
What time? How long?

Analogue and digital clocks

P19: What is the time..50 minutes after hour and a half later?

P20: Match the analogue time with the digital time

P23: Four clocks : analogue and digital
Show or hide the digital time or the hands on each clock. Children could draw hands on the clocks or work out how long in between the times shown on the clocks.
Time buttonsUse these buttons to generate new times: 15 = time shown every 15 minutes.
The hands on clock button Click on these buttons to hide or show the hands on each clock.

A section of timetable
A section of a timetable.

Link to the train timetableP21: Train timetable
If you are using Internet Explorer press F11 to view the resource full-screen.

A seaside train travels along the promenade from the tower to the lighthouse. How long does it take...?
The train's timetable is shown.
The timetable shows the 24 hour arrival and departure times of the train. Click on the 'train' button to start the journey. -

Random number generator: target board
Link to the number generator
A screenshot of the number generator.

P22: A flexible whiteboard resource which generates 24 different sets of numbers; similar to a target board. The resource will open in a new window.

Options include:

Money: add up to £1.00
Length less than 10cm: mm and cm
Length less than 2m: mm, cm and m
Matching lengths, eg 21mm = 2.1cm
12 and 24-hour times

The option buttonsSelect the type of numbers to be generated by clicking on the numbered buttons at the top.
18: money, 19: length less than 10cm, 20: length less than 2m, 21: Matching lengths
22: Random 12-hour times (5 minutes) 23: Random 12-hour times 24: 24-hour times (in pairs)

The buttons usedThe colour of the number can be changed. Select one of 8 colours then click on a number.

The numbers can be put arranged in a grid, click this button arrange in a table
or arranged randomly, click this button arrange randomly

The numbers can be grouped by dragging them about.

The numbers can be discarded by dragging them to the bin.

Children can use the resource to match pairs:
eg 3x5 and 15 (times-tables 1)
eg 35 and 70 (doubles)

A clock starts when a set of numbers has been generated. The clock can be hidden or shown (click the green clock button). It can be stopped by clicking the 'stop the clock' button!
The clock can be used to see who can match the pairs in the quickest time.

Copyright (c) [iMathLearning Inc.]. All rights reserved