Basic Mathematical Operations: MCQ test, Set 10

$7 - 6 =$
A $13$ B $2$ C $3$ D $1$

Answer and solution

Answer: (D) $1$

Count back $6$ from $7$ .

$7 - 6 = 1$
$4 + \square = 10$ . The number in the box is
A $7$ B $14$ C $6$ D $5$

Answer and solution

Answer: (C) $6$

$\square = 10 - 4 = 6$

Check: $4 + 6 = 10$
On the number line, start at $70$ and jump back $9$ steps. You land on
A $61$ B $79$ C $60$ D $62$

Answer and solution

Answer: (A) $61$

Jumping back $9$ steps from $70$ means $70 - 9$ .

$70 = 60 + 10$ and $10 - 9 = 1$ , so $70 - 9 = 60 + 1 = 61$
$67 - 2 =$
A $69$ B $47$ C $64$ D $65$

Answer and solution

Answer: (D) $65$

Take $2$ from the units digit: $7 - 2 = 5$ ; the tens digit $6$ stays.

$67 - 2 = 65$
$66 - 6 =$
A $60$ B $59$ C $61$ D $72$

Answer and solution

Answer: (A) $60$

Take $6$ from the units digit: $6 - 6 = 0$ ; the tens digit $6$ stays.

$66 - 6 = 60$
By the 1st method, $62 - 4 = 60 - \square$ . The number in the box is
A $2$ B $3$ C $4$ D $6$

Answer and solution

Answer: (A) $2$

1st method: take $2$ out of $4$ first ( $4 - 2 = 2$ ): $62 - 4 = 60 - 2 = 58$

So the box is $2$
$63 - 7 =$
A $64$ B $56$ C $66$ D $70$

Answer and solution

Answer: (B) $56$

1st method: take $3$ out of $7$ first ( $7 - 3 = 4$ ): $63 - 7 = 60 - 4 = 56$
$85 - 20 =$
A $65$ B $105$ C $83$ D $75$

Answer and solution

Answer: (A) $65$

Take $2$ tens from $8$ tens: $8 - 2 = 6$ ; the units digit $5$ stays.

$85 - 20 = 65$
$76 - 48 =$
A $28$ B $32$ C $124$ D $38$

Answer and solution

Answer: (A) $28$

2nd method: add $2$ to both: $76 - 48 = 78 - 50 = 28$
$78 - 43 =$
A $121$ B $35$ C $36$ D $45$

Answer and solution

Answer: (B) $35$

units $8 - 3 = 5$ , tens $7 - 4 = 3$ : $78 - 43 = 35$
$370 - 3 =$
A $368$ B $377$ C $373$ D $367$

Answer and solution

Answer: (D) $367$

$370 = 360 + 10$ and $10 - 3 = 7$ , so $370 - 3 = 360 + 7 = 367$
$365 - 47 =$
A $322$ B $328$ C $318$ D $412$

Answer and solution

Answer: (C) $318$

2nd method: add $3$ to both: $365 - 47 = 368 - 50 = 318$
$100 - 41 =$
A $69$ B $58$ C $61$ D $59$

Answer and solution

Answer: (D) $59$

Take away the tens first: $100 - 40 = 60$

$100 - 41 = 60 - 1 = 59$
$100 - 33 = \square - 3$ . The number in the box is
A $60$ B $80$ C $70$ D $67$

Answer and solution

Answer: (C) $70$

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

So $100 - 33 = 70 - 3$ ; the box is $70$
$102 - 7 =$
A $105$ B $95$ C $85$ D $96$

Answer and solution

Answer: (B) $95$

Take $2$ from both: $102 - 7 = 100 - 5$

$100 - 5 = 95$
$182 - 95 =$
A $187$ B $113$ C $97$ D $87$

Answer and solution

Answer: (D) $87$

3rd method: $182 - 100 = 82$ and $100 - 95 = 5$

$182 - 95 = 82 + 5 = 87$
$60 + 24 =$
A $30$ B $84$ C $94$ D $74$

Answer and solution

Answer: (B) $84$

Add the tens: $60 + 20 = 80$ ; the units digit $4$ stays.

$60 + 24 = 84$
$70 + 70 =$
A $14$ B $150$ C $130$ D $140$

Answer and solution

Answer: (D) $140$

$7$ tens $+$ $7$ tens $=$ $14$ tens

$70 + 70 = 140$
$32 + 42 =$
A $75$ B $64$ C $74$ D $84$

Answer and solution

Answer: (C) $74$

Tens: $30 + 40 = 70$

Units: $2 + 2 = 4$

$32 + 42 = 70 + 4 = 74$
In $2178 \div 9$ , the first step is $21 \div 9$ . The remainder after this step is
A $12$ B $3$ C $2$ D $6$

Answer and solution

Answer: (B) $3$

$9 \times 2 = 18$ is the biggest number in the $9$ table that is not more than $21$ .

$21 - 18 = 3$
$3504 \div 8 =$
A $428$ B $4038$ C $438$ D $439$

Answer and solution

Answer: (C) $438$

Long division with the $8$ table gives $438$ .

Check: $8 \times 438 = 3504$
$715738 \div 2 =$
A $357869$ B $357859$ C $357870$ D $3057869$

Answer and solution

Answer: (A) $357869$

Divide digit by digit with the $2$ table: $715738 \div 2 = 357869$

Check: $2 \times 357869 = 715738$
$16088 \div 2 =$
A $844$ B $8044$ C $80044$ D $8440$

Answer and solution

Answer: (B) $8044$

When a brought-down number is less than $2$ , a $0$ goes in the quotient.

$16088 \div 2 = 8044$ (check: $2 \times 8044 = 16088$ )
$4026 \div 11 =$
A $367$ B $3066$ C $365$ D $366$

Answer and solution

Answer: (D) $366$

Long division with the $11$ table gives $366$ .

Check: $11 \times 366 = 4026$
$\displaystyle \frac{16}{4} =$
A $5$ B $64$ C $4$ D $12$

Answer and solution

Answer: (C) $4$

$\displaystyle \frac{16}{4}$ means $16 \div 4$ .

$4 \times 4 = 16$ , so $\displaystyle \frac{16}{4} = 4$

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MCQ test, Set 10