Maths/ICT IWB Project 2008
Year Group: 2
Block and Unit: Block C, Unit 2
Lesson: 5
Context: At the fairground – buried
treasure.
Learning Objectives: To sort objects
according to the units used to weigh them
(g or kg).
To estimate and weigh objects accurately.
To read scales – weight
To order weights.
Resources (including ICT):
Selection of small objects to bury in
sandpit
Sandpit
Spade
Weighing scales
Weights
Sheets on reading scales
Mathematical Vocabulary:
Measure
Unit
Kilogram
Half kilogram
Balance
Scales
Weight
Heavier
Heaviest
Oral Mental Starter:
Selection of objects on IWB. Children to decide whether they would record their weight
in g or kg. Write on individual whiteboards. Children to then move them into the correct
circle on the IWB, explaining reasons.
Main teaching and differentiated activities:
Recap with children on the fact that we use scales to weigh objects. Have a selection of
classroom objects on the IWB, together with weighing scales. Pass a ‘real’ copy of each
object round for the children to feel, together with some weights so that the children can
physically weigh the objects. Children to estimate the weight of each object, to be
recorded by the teacher, then come and move the pointer on the scales to show that
weight.
Success criteria:
*I know where the scale starts.
*I know what each small division on a scale is worth.
*I can read, and interpret, where the pointer is on a scale.
*I can estimate the weight of an object.
*I can put objects in order of weight.
*I can weigh objects accurately.
BA independent – Complete sheet on reading scales (100g intervals). (See attachments,
weight – below average). Also mark specified weights onto scales by drawing the
pointers on (100g intervals). Then order a selection of weights written in grams.
A, with teacher – Children to dig for objects in the sandpit. For each object found, weigh
Maths/ICT IWB Project 2008
physically in hands to make an estimate. Have a selection of weights for children to put
in opposite hand to the object so that they can make a sensible estimate. Weigh objects
on scales to nearest 10g division. Note down whether estimate was within 100g of actual
weight. (See attachments, weighing objects table – average).
AA with TA – Children to dig for objects in the sandpit. For each object found, weigh
physically in hands to make an estimate. Have a selection of weights for children to put
in opposite hand to the object so that they can make a sensible estimate. Weigh objects
on scales to nearest 10g division. Work out difference between estimated and actual
weight. (See attachments, weighing objects table – above average).
Plenary: Selection of objects on the IWB. Children to help move them into order from
lightest to heaviest.
Children to use thinking thumbs/self assessment to show how well they have met the
learning objectives.
Assessment:
Is this object heavier or lighter than 1kg?
How much do you estimate this object weighs?
Which of these objects is heavier?
How much heavier is this object than that one?
What is the difference between your estimate of weight and the actual weight?