## It’s easy to assume that a student knows the meaning of all the words used in the Year 6 SATS maths vocabulary..

… but, just in case, here’s a list of some of the more common maths terms used. These have been taken from SATS papers 2001 – 2013. I hope they are useful and please do let me know if I’ve missed any!

**Angles **Angles are formed when 2 straight lines meet at a point. They are measured using ‘degrees,’ and there are 360 degrees in a full circle. The symbol for degrees is a ° after the number.

Different sized angles have different names.

**Acute** angles are angles smaller than 90 degrees

**Right angles** are 90 degrees

**Obtuse **angles are larger than 90 degrees but smaller than 180 degrees.

**Reflex** angles are larger than 180 degrees but smaller than 360 degrees.

**Area ** This is the amount of surface space in a shape. It’s usually a measurement of ‘squared centimetres’ on a SATS paper, although you can have ‘metres squared,’ or even ‘kilometres squared.’ The square bit is a ² after the unit, so cm² or m².^{
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**Average **Is the same a **mean. **This is a mathematical phrase, as there are lots of different types of ‘averages’ – you’ll find out about these in High School!

**Calculate **means to ‘work out.’ Make sure that you always show your working. Sometimes the question will ask you to, and you might get extra marks.

**Capacity **This is the amount that something can hold, like a kettle or a jug. It can be measured in litres, millilitres or in cubic centimetres. With this measurement the cubic bit is a ³ after the unit. So, cm³ or m³. A useful tip is to remember:^{
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- 1000cm³ is the same as 1 litre
- There are also 1000 millilitres in 1 litre

**Century **This usually means 100 years.

**Decade ** This means 10 years.

**Degree **The unit of measurement we use for measuring angles and also temperature.

**Difference **Sometimes you might know this as ‘takeaway,’ or ‘subtract.’ Difference means the same thing … to find the difference between 2 numbers, you need to take the smaller number away from the larger one. So, the *difference* between 12 and 4 is 8.

**Equilateral triangle **A type of triangle with sides of equal lengths and equal angles.

There are 3 other types of triangles:

**Isosceles** This is where 2 angles and 2 sides are the same

**Scalene** Where all the angles and sides are different measurements

**Right angle** Where one of the angles is a 90° right angle

**Factors **A factor is a whole number which will divide *exactly* into another whole number. So, a factor of 12 is the number 3. (Actually 12 has these factors: 1, 2, 3, 4 , 6 and 12. All these numbers will divide exactly into 12.)

**Inverse operation ** This is a question that asks you to calculate the value of a ‘missing gap.’ The inverse operation is the opposite, so adding is the inverse of subtracting, or multiplying is the inverse of dividing.

If you have a calculation with a missing gap, you can use the inverse operation to solve it.

To solve 127 + ? = 200 you could rewrite it as 200 – 127 = 73

**Mean** This means the same as ‘average.’ With this type of question you are usually given a set of results, such as:

“John, Paul, Sam and **Sue*** walk to school. John and Sue take 20 minutes, Paul takes 32 minutes, Sam takes 11 minutes, Ranjit takes 16 minutes. Work out the mean average. ”

To answer this question you would add all the numbers and then divide by 5, which is the ‘number of numbers.’

So

which is the same as .

The mean average time is 20 minutes.

**Median **This is another type of average and means the number in the middle when arranged in order from smallest to largest.

With John, Paul, Sam, Sue and Ranjit the median value would also be 20. It’s the middle value in 12, 16, 20, 20, 32.

**Mode **Is the number which appears most frequently in a set of results.

With John, Paul, Sam and Sue and Ranjit the mode value is 20 as this walking time is more common than the others.

**Multiple **Multiples are whole numbers that are made by adding lots of a smaller number together. So, 12 is a multiple of 3** ** (which has been added together 4 times)… or 25 is a multiple of 5.

**Percentages **% means ‘out of 100.’ 40% is the same as .

Sometimes it’s much easier to imagine a percentage. 40% is exactly the same as – it just sounds more.

**Perimeter** This is the distance around the outside of a shape. Imagine running around the edge of the playground, how far will you run?

**Prime numbers **are numbers which can only be divided by themselves and 1.

So, the prime numbers are 1,3, 5, 7, 11 and so on (and on, and on… prime numbers can get very large)

**Product **The product is the answer when numbers are multiplied. The product of 6 and 5 is 30 because 6×5=30.

S**calene triangle **A triangle with no equal sides – the kind I usually draw when I’m not using a ruler!

**Square number **The total when a number is multiplied by itself.** **So, 1×1=1, 2×2 = 4, 3×3 = 9

All the square numbers upto 100 are:

1, 4, 9, 16, 25, 36, 49, 64, 81 and 100

You can work out square numbers by using dots:

**Sum **To find the sum of a group of numbers, you add the numbers together.

Need help with SATS? Visit the YouTube playlist on KS2-3 or you could search the channel here.

Year 6 SATS Revision cards available here.

* Thank you to Sue for suggesting the idea for this post!

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