Basic Mathematical Operations: MCQ test, Set 5

$6 + 1 =$
A $5$ B $6$ C $8$ D $7$

Answer and solution

Answer: (D) $7$

Start at $6$ and count on $1$ : $6 + 1 = 7$
$6 + \square = 10$ . The number in the box is
A $5$ B $3$ C $16$ D $4$

Answer and solution

Answer: (D) $4$

$\square = 10 - 6 = 4$

Check: $6 + 4 = 10$
$90 - 3 =$
A $87$ B $97$ C $93$ D $88$

Answer and solution

Answer: (A) $87$

$90 = 80 + 10$ and $10 - 3 = 7$ , so $90 - 3 = 80 + 7 = 87$
$39 - 8 =$
A $47$ B $31$ C $32$ D $30$

Answer and solution

Answer: (B) $31$

Take $8$ from the units digit: $9 - 8 = 1$ ; the tens digit $3$ stays.

$39 - 8 = 31$
$54 - 4 =$
A $49$ B $14$ C $50$ D $58$

Answer and solution

Answer: (C) $50$

Take $4$ from the units digit: $4 - 4 = 0$ ; the tens digit $5$ stays.

$54 - 4 = 50$
$92 - 4 =$
A $98$ B $96$ C $88$ D $92$

Answer and solution

Answer: (C) $88$

1st method: take $2$ out of $4$ first ( $4 - 2 = 2$ ): $92 - 4 = 90 - 2 = 88$
By the 2nd method, $55 - 8 = \square - 10$ . The number in the box is
A $57$ B $63$ C $53$ D $47$

Answer and solution

Answer: (A) $57$

2nd method: add $2$ to both: $55 - 8 = 57 - 10 = 47$

So the box is $57$
$60 - 40 =$
A $100$ B $30$ C $20$ D $10$

Answer and solution

Answer: (C) $20$

$6$ tens $-$ $4$ tens $=$ $2$ tens

$60 - 40 = 20$
By the 2nd method, $91 - 62 = \square - 70$ . The number in the box is
A $99$ B $29$ C $93$ D $83$

Answer and solution

Answer: (A) $99$

Add $8$ to both numbers so that $62$ becomes $70$ .

$91 - 62 = 99 - 70$ , so the box is $99$
$39 - 29 =$
A $11$ B $68$ C $10$ D $20$

Answer and solution

Answer: (C) $10$

units $9 - 9 = 0$ , tens $3 - 2 = 1$ : $39 - 29 = 10$
$390 - 27 =$
A $363$ B $373$ C $417$ D $377$

Answer and solution

Answer: (A) $363$

2nd method: add $3$ to both: $390 - 27 = 393 - 30 = 363$
$280 - 2 =$
A $279$ B $288$ C $282$ D $278$

Answer and solution

Answer: (D) $278$

$280 = 270 + 10$ and $10 - 2 = 8$ , so $280 - 2 = 270 + 8 = 278$
$100 - 54 = \square - 4$ . The number in the box is
A $60$ B $50$ C $40$ D $46$

Answer and solution

Answer: (B) $50$

Take away the tens first: $100 - 50 = 50$

So $100 - 54 = 50 - 4$ ; the box is $50$
$100 - 50 =$
A $150$ B $60$ C $50$ D $40$

Answer and solution

Answer: (C) $50$

$10$ tens $-$ $5$ tens $=$ $5$ tens

$100 - 50 = 50$
$140 - 90 =$
A $230$ B $150$ C $50$ D $40$

Answer and solution

Answer: (C) $50$

Take $40$ from both: $140 - 90 = 100 - 50$

$100 - 50 = 50$
$122 - 49 =$
A $173$ B $73$ C $127$ D $83$

Answer and solution

Answer: (B) $73$

3rd method: $122 - 100 = 22$ and $100 - 49 = 51$

$122 - 49 = 22 + 51 = 73$
$10 + 60 =$
A $80$ B $7$ C $60$ D $70$

Answer and solution

Answer: (D) $70$

$1$ ten $+$ $6$ tens $=$ $7$ tens

$10 + 60 = 70$
$70 + 69 =$
A $139$ B $149$ C $129$ D $76$

Answer and solution

Answer: (A) $139$

Add the tens: $70 + 60 = 130$ ; the units digit $9$ stays.

$70 + 69 = 139$
$35 + 92 =$
A $27$ B $137$ C $117$ D $127$

Answer and solution

Answer: (D) $127$

Tens: $30 + 90 = 120$

Units: $5 + 2 = 7$

$35 + 92 = 120 + 7 = 127$
$2133 \div 3 =$
A $712$ B $7011$ C $711$ D $701$

Answer and solution

Answer: (C) $711$

Long division with the $3$ table gives $711$ .

Check: $3 \times 711 = 2133$
In $4050 \div 6$ , the first step is $40 \div 6$ . The remainder after this step is
A $6$ B $4$ C $2$ D $10$

Answer and solution

Answer: (B) $4$

$6 \times 6 = 36$ is the biggest number in the $6$ table that is not more than $40$ .

$40 - 36 = 4$
$882024 \div 2 =$
A $441013$ B $441012$ C $44112$ D $4041012$

Answer and solution

Answer: (B) $441012$

Divide digit by digit with the $2$ table: $882024 \div 2 = 441012$

Check: $2 \times 441012 = 882024$
$10055 \div 5 =$
A $2011$ B $20011$ C $2110$ D $211$

Answer and solution

Answer: (A) $2011$

When a brought-down number is less than $5$ , a $0$ goes in the quotient.

$10055 \div 5 = 2011$ (check: $5 \times 2011 = 10055$ )
$7056 \div 12 =$
A $5088$ B $588$ C $587$ D $589$

Answer and solution

Answer: (B) $588$

Long division with the $12$ table gives $588$ .

Check: $12 \times 588 = 7056$
$\displaystyle \frac{24}{3} =$
A $21$ B $9$ C $72$ D $8$

Answer and solution

Answer: (D) $8$

$\displaystyle \frac{24}{3}$ means $24 \div 3$ .

$3 \times 8 = 24$ , so $\displaystyle \frac{24}{3} = 8$

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MCQ test, Set 5