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Science and Technology

Science and Technology

 
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Mental Arithmetic 0006   Difficult

 
 
Correct answers are highlighted in blue
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1. What is the square root of 784?
 
22
24
26
28
 

 
2. What results when the cube of 6 is added to the square root of 361?
 
53
55
233
235

216 +19
 

 
3. What is the cost of 18kg of plums at a price of 23.5 pence per kg?
 
4.13
4.17
4.23
4.27
 

 
4. What is the next number in the series 2, 3, 8, 63 ….?
 
125
248
2848
3968

Number squared, then minus one
 

 
5. What is the sum of the numbers between 31 and 36 (inclusive)?
 
201
202
203
204
 

 
6. If two sides of a right-angled triangle are 5cm and 12cm long, how long is the third side?
 
6cm
9cm
13cm
17cm

Pythagoras - 5² + 12² = 13²
 

 
7. What is the quarts in a gallon multiplied by the acres in a square mile?
 
256
384
2560
3840

4 x 640
 

 
8. What is 5² + 13² + 15²?
 
369
399
419
439

25 + 169 + 225
 

 
9. If a baker's dozen of items costs £3.51, what does each item cost individually?
 
19 pence
27 pence
29 pence
31 pence

3.51 divided by 13
 

 
10. What is the next number in the series 3, 12, 102 ....?
 
304
408
622
1002

number times 10, minus 18
 

 
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