Maths

Mental Maths (2)

One of the tests you will have to do is an oral test. You must try and do the working out in your head.
These tests see how quick you can answer questions. Many of them will give easy answers if you listen and think carefully.
The best way to do this type of test is to practise frequently.
Today we are going to do another of these tests.

DON’T PANIC!

INSTRUCTIONS

Below are 20 questions. Get someone to read them to you.

Each question should be read out clearly twice and you have 5 seconds to answer after the second reading of the question.

(Some are 10 seconds and it says ten next to them)

 No Question 1 39 + 21 2 399-299 3 6 X 8 4 17 X 10 5 205 ÷ 100 6 An orange costs 49p How much do 3 oranges cost? 7 51-13 8 A bag of sweets weighs 20g How many would weigh exactly 1 kg? 9 A bag of potatoes weighs 56kg how many 2 kg bags can you get from it? 10 What is the biggest number you can make out of the following 3 numbers 4,6,9? 11 2.9 X 100 12 A square has got sides of length 4 cm What is its area? 13 What is the length of its perimeter, if the sides of the square are 4cm long? 14 In a school of 120 children only 1/3 are girls. How many boys are in the school? 15 A triangle has got three angles a=60 b=50 What is the value of c? 16 If I am facing North and I turn clockwise through 180 degrees. Which direction am I facing? 17 How many grams are there in 3 5 Kg 18 A sack of letters weighs 3 kg (without the weight of the sack). Each letter weighs 20g. How many letters are in the sack? (10secs). 19 I set off on a journey at 7.55 am. I have been travelling for 55 min.  What time is it now? 20 How many minutes are there in 4 and half-hours?

 No Question Answer 1 39 + 21 60 2 399-299 100 3 6 X 8 48 4 17 X 10 170 5 205 ÷ 100 2.05 6 An orange costs 49p How much do 3 oranges cost? £1.47p 7 51-13 38 8 A bag of sweets weighs 20g How many would weigh exactly 1 kg? 50 9 A bag of potatoes weighs 56kg how many 2 kg bags can you get from it? 28 10 What is the biggest number you can make out of the following 3 numbers 4,6,9? 964 11 2.9 X 100 290 12 A square has got sides of length 4 cm What is its area? 16cm2 13 What is the length of its perimeter, if the sides of the square are 4cm long? 16cm 14 In a school of 120 children only 1/3 are girls. How many boys are in the school? 80 boys 15 A triangle has got three angles a=60 b=50 What is the value of c? 70 degrees 16 If I am facing North and I turn clockwise through 180 degrees. Which direction am I facing? South 17 How many grams are there in 3 5 Kg 3500 18 A sack of letters weighs 3 kg (without the weight of the sack). Each letter weighs 20g. How many letters are in the sack? (10secs.) 150 19 I set off on a journey at 7.55 am. I have been travelling for 55 min. What time is it now? 8.50 am 20 How many minutes are there in 4 and half-hours? 270 minutes

Well how did you do? What did you notice about these questions?
They contain the following

Conversions:            minutes to hours                        hours to minutes

Grams to kilograms                  kilograms to grams

Fractions

Triangles

Area

Perimeters

Numbers close together

X by 10, 100

÷ by 10 ,100

Time

subtraction

Multiplication

Division.

So these are the things you will need to practise over the next few days.

To finish off here are five more questions. There are more difficult, but you do get 15 seconds to answer each of these.

INSTRUCTIONS

Below are 5 questions. Get someone to read them to you.

Each question should be read out clearly twice and you have 15 seconds to answer after the second reading of the question.

 No Question 1 Find 15% of  £300 2 I have £5 and I buy 4 comics at 45p each. How much change will I have? 3 Mrs Paid is 32. Her daughter is 1/4 of her age, but only half as old as her brother. What is the age of Mrs Paid's son? 4 4 kg of apples contains 40 apples. What is the average weight of each apple? 5 What is 50% of a 1/2