Year 3 Term 1

Key Concepts – Number – Place Value

• That place value is a really important concept which supports all other areas of mathematics and is based on unitizing, treating a group of things as one ‘unit'
• The largest 3-digit number is 999 and the smallest 3-digit number is 100
• The value of a digit is determined by its position in a number, so in any number the largest digit may have the smallest value and the smallest digit may have the largest value. eg 357 equates to three hundreds and five tens and seven ones,

300 +50+7=357

• Clear understanding about the importance of zero within a number.
• The importance of the decimal number system is required to manipulate and calculate with numbers.
• There are other areas of mathematics that uses different number systems to the decimal system including time, packaging systems and measures such as miles.

Key Vocabulary – Place Value

Thousand

One, Two, Three digit numbers

Equal to

Greater than, less than

One More, 10 more, 100 more

Compare

Order

Between

Half-way between

Value

Key Concepts – Properties of Shape

• Initially 2D shapes are defined by the number of sides and vertices they have and that there are regular and irregular shapes and that some 2D shapes have specific names dependent upon their properties.
• Pupils need a clear understanding that the number of sides, the number of vertices, symmetrical properties, size of angle, whether lines are perpendicular or parallel are the properties of shape and how shapes are defined.
• 2D shapes are the faces of 3D shapes and that there are different 3D shapes that share the same 2D shapes.

Key Vocabulary – Properties of Shape

Group, sort

Cube, cuboid, pyramid, sphere, cone, cylinder, circle, triangle, square

Pentagon, hexagon

Shape

Flat, Hollow, Solid Corner. Vertices. Face, Side,

Angle, Acute, Obtuse, Right Angle, Quadrilateral

Irregular, regular

Parallel, perpendicular

Common Misconceptions - Place Value

That estimations are good guesses and are unlikely to be the exact answer.as this would suggest that there would be no need to estimate.

That only the digits 0 – 9 are used to make all other numbers and the value of the number is dependent upon the places that they hold in a number.

When making complements to 100 – children will often give responses that make a total of 110 and they need to understand that the ones need to add to 10 and the 10s need to add to 90 – ie the complement to 100 of 67 is 33

Common Misconception - Properties of Shape

What do we mean by a 2D shape and a 3D shape – 2D just have length and width and 3D have length, width and breadth

That 2D shapes are only found as a face of a 3D shape. (You are not able to hold a 2D shape.)

That 2D shapes that have all sides the same size, all angles the same size are regular and others are irregular.

That it doesn’t matter in what orientation a shape is, it is still that shape according to properties, ie a square or ‘upside down’ triangle etc.