Basic Mathematical Operations: MCQ test, Set 3

$4 + 4 =$
A $8$ B $7$ C $9$ D $10$

Answer and solution

Answer: (A) $8$

Start at $4$ and count on $4$ : $4 + 4 = 8$
$8 + \square = 9$ . The number in the box is
A $9$ B $1$ C $2$ D $17$

Answer and solution

Answer: (B) $1$

$\square = 9 - 8 = 1$

Check: $8 + 1 = 9$
$20 - 6 =$
A $14$ B $15$ C $26$ D $24$

Answer and solution

Answer: (A) $14$

$20 = 10 + 10$ and $10 - 6 = 4$ , so $20 - 6 = 10 + 4 = 14$
$93 - 3 =$
A $89$ B $63$ C $90$ D $96$

Answer and solution

Answer: (C) $90$

Take $3$ from the units digit: $3 - 3 = 0$ ; the tens digit $9$ stays.

$93 - 3 = 90$
$87 - 2 =$
A $85$ B $89$ C $84$ D $67$

Answer and solution

Answer: (A) $85$

Take $2$ from the units digit: $7 - 2 = 5$ ; the tens digit $8$ stays.

$87 - 2 = 85$
$61 - 5 =$
A $64$ B $66$ C $55$ D $56$

Answer and solution

Answer: (D) $56$

1st method: take $1$ out of $5$ first ( $5 - 1 = 4$ ): $61 - 5 = 60 - 4 = 56$
By the 1st method, $53 - 5 = 50 - \square$ . The number in the box is
A $5$ B $2$ C $3$ D $8$

Answer and solution

Answer: (B) $2$

1st method: take $3$ out of $5$ first ( $5 - 3 = 2$ ): $53 - 5 = 50 - 2 = 48$

So the box is $2$
$70 - 10 =$
A $60$ B $50$ C $80$ D $70$

Answer and solution

Answer: (A) $60$

$7$ tens $-$ $1$ ten $=$ $6$ tens

$70 - 10 = 60$
By the 2nd method, $46 - 19 = \square - 20$ . The number in the box is
A $47$ B $55$ C $45$ D $27$

Answer and solution

Answer: (A) $47$

Add $1$ to both numbers so that $19$ becomes $20$ .

$46 - 19 = 47 - 20$ , so the box is $47$
$93 - 77 =$
A $170$ B $16$ C $26$ D $24$

Answer and solution

Answer: (B) $16$

2nd method: add $3$ to both: $93 - 77 = 96 - 80 = 16$
$260 - 22 =$
A $248$ B $238$ C $242$ D $282$

Answer and solution

Answer: (B) $238$

2nd method: add $8$ to both: $260 - 22 = 268 - 30 = 238$
$370 - 9 =$
A $362$ B $379$ C $371$ D $361$

Answer and solution

Answer: (D) $361$

$370 = 360 + 10$ and $10 - 9 = 1$ , so $370 - 9 = 360 + 1 = 361$
$100 - 35 = \square - 5$ . The number in the box is
A $60$ B $65$ C $70$ D $80$

Answer and solution

Answer: (C) $70$

Take away the tens first: $100 - 30 = 70$

So $100 - 35 = 70 - 5$ ; the box is $70$
$100 - 94 =$
A $14$ B $16$ C $5$ D $6$

Answer and solution

Answer: (D) $6$

Take away the tens first: $100 - 90 = 10$

$100 - 94 = 10 - 4 = 6$
$110 - 20 =$
A $130$ B $90$ C $110$ D $190$

Answer and solution

Answer: (B) $90$

Take $10$ from both: $110 - 20 = 100 - 10$

$100 - 10 = 90$
$101 - 9 =$
A $93$ B $82$ C $92$ D $108$

Answer and solution

Answer: (C) $92$

Take $1$ from both: $101 - 9 = 100 - 8$

$100 - 8 = 92$
$30 + 30 =$
A $60$ B $70$ C $50$ D $6$

Answer and solution

Answer: (A) $60$

$3$ tens $+$ $3$ tens $=$ $6$ tens

$30 + 30 = 60$
$20 + 75 =$
A $105$ B $77$ C $85$ D $95$

Answer and solution

Answer: (D) $95$

Add the tens: $20 + 70 = 90$ ; the units digit $5$ stays.

$20 + 75 = 95$
$42 + 96 =$
A $148$ B $128$ C $138$ D $38$

Answer and solution

Answer: (C) $138$

Tens: $40 + 90 = 130$

Units: $2 + 6 = 8$

$42 + 96 = 130 + 8 = 138$
$2982 \div 7 =$
A $416$ B $4026$ C $426$ D $427$

Answer and solution

Answer: (C) $426$

Long division with the $7$ table gives $426$ .

Check: $7 \times 426 = 2982$
In $2625 \div 7$ , the first step is $26 \div 7$ . The remainder after this step is
A $2$ B $12$ C $3$ D $5$

Answer and solution

Answer: (D) $5$

$7 \times 3 = 21$ is the biggest number in the $7$ table that is not more than $26$ .

$26 - 21 = 5$
$310162 \div 2 =$
A $15581$ B $1055081$ C $155082$ D $155081$

Answer and solution

Answer: (D) $155081$

Divide digit by digit with the $2$ table: $310162 \div 2 = 155081$

Check: $2 \times 155081 = 310162$
$28545 \div 5 =$
A $5790$ B $5709$ C $57009$ D $579$

Answer and solution

Answer: (B) $5709$

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

$28545 \div 5 = 5709$ (check: $5 \times 5709 = 28545$ )
$4716 \div 12 =$
A $393$ B $392$ C $3093$ D $394$

Answer and solution

Answer: (A) $393$

Long division with the $12$ table gives $393$ .

Check: $12 \times 393 = 4716$
$\displaystyle \frac{20}{4} =$
A $6$ B $16$ C $5$ D $80$

Answer and solution

Answer: (C) $5$

$\displaystyle \frac{20}{4}$ means $20 \div 4$ .

$4 \times 5 = 20$ , so $\displaystyle \frac{20}{4} = 5$

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MCQ test, Set 3