11+ Maths Speed recall 10 Sep

Which of these is longest?

• 113 cm

• 0.12 m

• 1193 mm

• 1.15 m

Answer explanation

Let's write them all in the same units. I'll choose cm for this one this time...

113 cm = 113 cm

0.12 m = 12 cm

1193 mm = 119.3 cm

1.15m = 115 cm

What does the digit 5 represent in the number 125 967

• Five hundreds

• Five thousands

• Five tens

• Five tens of thousands

Answer explanation

The number 125 967 is made up of

1 hundreds of thousands

2 tens of thousands

5 thousands

9 hundreds

6 tens and

7 ones

Which one of these numbers is prime?

• 15

• 21

• 23

• 39

Answer explanation

15 = 3 x 5

21 = 3 x 7

39 = 3 x 13

Number 23 is only exactly divisible by itself and 1 so it is prime.

What is the next number is the sequence 1, 4, 7, 10, ?

• 12

• 14

• 13

• 11

Answer explanation

The numbers increase by 3 each time

The sequence is 1, 4, 7, 10, 13

Which is the smallest number?

38.5, 38.493, 38.611, 39.001

• 38.5

• 38.493

• 38.611

• 39.001

Three of these fractions are equivalent. Which ones?

• $\frac{4}{5}$

• $\frac{16}{20}$

• $\frac{80}{100}$

• $\frac{8}{20}$

Answer explanation

$\frac{16}{20}\ =\ \frac{4}{5}$

$\frac{80}{100}=\frac{4}{5}$

$\frac{8}{20}=\frac{2}{5}\$ which is different to the others

TRUE or FALSE?

A Prism has the same face at each end.

• TRUE

• FALSE

Answer explanation

It is TRUE.

Here is a triangular prism. It has a triangle at each end.

What is 285 356 rounded to the nearest 100

• 285 000

• 285 300

• 285 400

• 285 360

• 285 350

Answer explanation

The digit 3 is the hundreds in the number 285 356

The digits after the 3 is five or more so we round the 3 up to a 4 to get 285 400

 $y\ +\ 7\ =\ 19$  
What is  $y$  ?

• 8

• -12

• 12

• 26

Answer explanation

 $y$  is 12. 

 $12\ +\ 7\ =\ 19$  

You can work it out by taking away 7 from both sides of the equation to get:
 $y\ =\ 19\ -\ 7$  

TRICKY ONE: Which of these is bigger?

•  $\frac{1}{4}of\ 24$  

•  $20\%\ of\ 35$  

Answer explanation

 $\frac{1}{4}\ of\ 24\ =\ 24\ \div4\ =\ 6$  

 $20\%\ of\ 35\ =\frac{20}{100}\ of\ 35\ =\ \frac{1}{5}\ of\ 35\ =\ 7$