Basic Mathematical Operations: MCQ test, Set 9

$3 + 3 =$
A $5$ B $8$ C $7$ D $6$

Answer and solution

Answer: (D) $6$

Start at $3$ and count on $3$ : $3 + 3 = 6$
$4 + \square = 5$ . The number in the box is
A $1$ B $2$ C $5$ D $9$

Answer and solution

Answer: (A) $1$

$\square = 5 - 4 = 1$

Check: $4 + 1 = 5$
$40 - 9 =$
A $41$ B $31$ C $32$ D $49$

Answer and solution

Answer: (B) $31$

$40 = 30 + 10$ and $10 - 9 = 1$ , so $40 - 9 = 30 + 1 = 31$
$87 - 3 =$
A $57$ B $90$ C $84$ D $83$

Answer and solution

Answer: (C) $84$

Take $3$ from the units digit: $7 - 3 = 4$ ; the tens digit $8$ stays.

$87 - 3 = 84$
$99 - 2 =$
A $101$ B $79$ C $96$ D $97$

Answer and solution

Answer: (D) $97$

Take $2$ from the units digit: $9 - 2 = 7$ ; the tens digit $9$ stays.

$99 - 2 = 97$
$22 - 5 =$
A $17$ B $23$ C $16$ D $27$

Answer and solution

Answer: (A) $17$

1st method: take $2$ out of $5$ first ( $5 - 2 = 3$ ): $22 - 5 = 20 - 3 = 17$
By the 1st method, $75 - 7 = 70 - \square$ . The number in the box is
A $5$ B $7$ C $2$ D $12$

Answer and solution

Answer: (C) $2$

1st method: take $5$ out of $7$ first ( $7 - 5 = 2$ ): $75 - 7 = 70 - 2 = 68$

So the box is $2$
$80 - 30 =$
A $50$ B $40$ C $60$ D $110$

Answer and solution

Answer: (A) $50$

$8$ tens $-$ $3$ tens $=$ $5$ tens

$80 - 30 = 50$
By the 2nd method, $63 - 25 = \square - 30$ . The number in the box is
A $58$ B $73$ C $38$ D $68$

Answer and solution

Answer: (D) $68$

Add $5$ to both numbers so that $25$ becomes $30$ .

$63 - 25 = 68 - 30$ , so the box is $68$
$45 - 26 =$
A $29$ B $71$ C $21$ D $19$

Answer and solution

Answer: (D) $19$

2nd method: add $4$ to both: $45 - 26 = 49 - 30 = 19$
$298 - 79 =$
A $219$ B $221$ C $377$ D $229$

Answer and solution

Answer: (A) $219$

2nd method: add $1$ to both: $298 - 79 = 299 - 80 = 219$
$230 - 8 =$
A $232$ B $222$ C $223$ D $238$

Answer and solution

Answer: (B) $222$

$230 = 220 + 10$ and $10 - 8 = 2$ , so $230 - 8 = 220 + 2 = 222$
$100 - 14 = \square - 4$ . The number in the box is
A $80$ B $90$ C $86$ D $100$

Answer and solution

Answer: (B) $90$

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

So $100 - 14 = 90 - 4$ ; the box is $90$
$100 - 48 =$
A $68$ B $62$ C $51$ D $52$

Answer and solution

Answer: (D) $52$

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

$100 - 48 = 60 - 8 = 52$
$110 - 40 =$
A $150$ B $130$ C $70$ D $170$

Answer and solution

Answer: (C) $70$

Take $10$ from both: $110 - 40 = 100 - 30$

$100 - 30 = 70$
$101 - 6 =$
A $85$ B $95$ C $105$ D $96$

Answer and solution

Answer: (B) $95$

Take $1$ from both: $101 - 6 = 100 - 5$

$100 - 5 = 95$
$40 + 20 =$
A $60$ B $6$ C $50$ D $70$

Answer and solution

Answer: (A) $60$

$4$ tens $+$ $2$ tens $=$ $6$ tens

$40 + 20 = 60$
$70 + 47 =$
A $54$ B $127$ C $117$ D $107$

Answer and solution

Answer: (C) $117$

Add the tens: $70 + 40 = 110$ ; the units digit $7$ stays.

$70 + 47 = 117$
$31 + 14 =$
A $55$ B $35$ C $45$ D $46$

Answer and solution

Answer: (C) $45$

Tens: $30 + 10 = 40$

Units: $1 + 4 = 5$

$31 + 14 = 40 + 5 = 45$
$1322 \div 2 =$
A $661$ B $6061$ C $651$ D $662$

Answer and solution

Answer: (A) $661$

Long division with the $2$ table gives $661$ .

Check: $2 \times 661 = 1322$
In $3429 \div 9$ , the first step is $34 \div 9$ . The remainder after this step is
A $16$ B $7$ C $3$ D $2$

Answer and solution

Answer: (B) $7$

$9 \times 3 = 27$ is the biggest number in the $9$ table that is not more than $34$ .

$34 - 27 = 7$
$435106 \div 2 =$
A $217554$ B $2017553$ C $217543$ D $217553$

Answer and solution

Answer: (D) $217553$

Divide digit by digit with the $2$ table: $435106 \div 2 = 217553$

Check: $2 \times 217553 = 435106$
$4216 \div 4 =$
A $1540$ B $154$ C $1054$ D $10054$

Answer and solution

Answer: (C) $1054$

When a brought-down number is less than $4$ , a $0$ goes in the quotient.

$4216 \div 4 = 1054$ (check: $4 \times 1054 = 4216$ )
$7898 \div 11 =$
A $7018$ B $717$ C $718$ D $719$

Answer and solution

Answer: (C) $718$

Long division with the $11$ table gives $718$ .

Check: $11 \times 718 = 7898$
$\displaystyle \frac{9}{3} =$
A $4$ B $3$ C $6$ D $27$

Answer and solution

Answer: (B) $3$

$\displaystyle \frac{9}{3}$ means $9 \div 3$ .

$3 \times 3 = 9$ , so $\displaystyle \frac{9}{3} = 3$

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MCQ test, Set 9