MARKING SCHEME FOR JSS1 MATHEMATICS FIRST TERM EXAMINATION

SECTION A: OBJECTIVE TEST

ALLOCATION OF MARKS: ½ mark each = 30 marks

SECTION B: ESSAY

ALLOCATION OF MARKS: 10 marks each = 30 marks

1. Spends \(40\%\) on food

Salary \(= ₦60 000\)

\(40\% of \(60 000\)  (½ mark)

\(\frac{40}{100} × \frac{60000}{1}\)

\(= 40 × 600\) (1 mark)

\(= 24 000\)  (1 mark)

1. (b) Even numbers from \(0\) to \(10\) are \(2,4,6,8,10\)

\(2 +4+6+8+10 = 30\)  (1 mark)

Converting \(30\) to binary

\(\begin{array}{c|c c} 2 & 30 \\ \hline 2 & 15 \text{ R } 0 & ↑\\ \hline 2 & 7 \text{ R } 1 & |\\ \hline 2 & 3 \text{ R } 1 & |\\ \hline 2 & 1 \text{ R } 1 & | \\\hline & 0 \text{ R } 1  & |\end{array}\)  (1 mark)

\(= 11110_2\)  (1 mark)

1. (c) \(70\%\) to fraction

\(\frac{70}{100} = \frac{7}{10}\)  (1 mark)

1. (d) \(6\frac{1}{2} + 3 \frac{1}{2} -(3\frac{1}{2} × 14) ÷ 7\)  (½ mark)

\(\frac{13}{2} + \frac{7}{2} -\Big(\frac{7}{2} × \frac{14}{1}\Big) × \frac{1}{7}\)

\(\frac{13 + 7}{2} -(\frac{49}{1} × \frac{1}{7})\)  (1 mark)

\(\frac{20}{2} -\frac{7}{1}\)  (½ mark)

\(= 10 -7 = 3\)  (1 mark)

TOTAL = 10 MARKS

2.