Mental Math

Simplify the following:  $6\ +\frac{3}{10}\ +\ \frac{4}{25}$  

• 6.46

• 6.34

• 6.44

Fahad has 60 cows. He sells 75% of them. How many does he still have?

• 30

• 45

• 15

Simplify the following:  $\frac{13}{100}\ +\ \frac{13}{1000}\ +\ 1.3$  

• 14.43

• 1.443

• 0.1443

Which one of the following is false?

• The sum of two even numbers is even

• The product of two odd numbers is odd

• The difference of two even numbers is even

• The sum of two odd numbers is odd

• None of these

Amina had to walk 2 kilometres to school. After she had walked 280 metres, she stopped for a rest. What fraction of the distance had she walked?

• $\frac{14}{10}$

• $\frac{14}{100}$

• $\frac{14}{1000}$

Sadiya has 500 Naira. She spends 64% of it. How much does she spend?

• 320 Naira

• 280 Naira

• 180 Naira

• 300 Naira

Decrease 150 in the ratio 5:6

• 250

• 150

• 125

• 25

Find the value of x if 3 : 5 = 15 : x

• 15

• 25

• 5

• 3

Find the value of M.
 $M^2\ +\ 64\ =\ 185$  

• 17

• 15

• 11

• 121

What fraction of a day is 6 hours 45 minutes?

• $\frac{9}{8}$

• $\frac{9}{32}$

• $\frac{9}{16}$

• $\frac{2}{9}$