Solve the following mental maths problems. Show your working out.

Question

ScanSolve AI Tutor · Accepted Answer

Here are the solutions for the mental maths problems:

1.

Multiply $2 \times 1$ .
$2 \times 1 = 2$
Add 3 to the result.
$2 + 3 = 5$
The answer is $\boxed{5}$

2.
Multiply $2 \times (-1)$ .
$2 \times (-1) = -2$
Add 3 to the result.
$-2 + 3 = 1$
The answer is $\boxed{1}$

3.
Multiply $0.2 \times 1$ .
$0.2 \times 1 = 0.2$
Subtract 3 from the result.
$0.2 - 3 = -2.8$
The answer is $\boxed{-2.8}$

4.
Multiply $4.5 \times 1$ .
$4.5 \times 1 = 4.5$
Add 3 to the result.
$4.5 + 3 = 7.5$
The answer is $\boxed{7.5}$

5.
Multiply $\frac{1}{2} \times 1$ .
$\frac{1}{2} \times 1 = \frac{1}{2}$
Subtract 3 from the result.
$\frac{1}{2} - 3 = \frac{1}{2} - \frac{6}{2} = \frac{1-6}{2} = \frac{-5}{2}$
The answer is $\boxed{-\frac{5}{2}}$

6.
Multiply $2 \times 1$ .
$2 \times 1 = 2$
Add 0.5 to the result.
$2 + 0.5 = 2.5$
The answer is $\boxed{2.5}$

7.
Multiply $2 \times \frac{3}{2}$ .
$2 \times \frac{3}{2} = 3$
Add 3 to the result.
$3 + 3 = 6$
The answer is $\boxed{6}$

8.
Multiply $2 \times \frac{5}{2}$ .
$2 \times \frac{5}{2} = 5$
Add $\frac{7}{8}$ to the result.
$5 + \frac{7}{8} = \frac{40}{8} + \frac{7}{8} = \frac{40+7}{8} = \frac{47}{8}$
The answer is $\boxed{\frac{47}{8}}$

9.
Multiply $-3 \times 1$ .
$-3 \times 1 = -3$
Subtract 3 from the result.
$-3 - 3 = -6$
The answer is $\boxed{-6}$

10.
Multiply $2 \times 100$ .
$2 \times 100 = 200$
Add 3 to the result.
$200 + 3 = 203$
The answer is $\boxed{203}$

Solve the following mental maths problems. Show your working out.

Step-by-step solution

Multiply $2 \times 1$ .

Add 3 to the result.

Multiply $2 \times (-1)$ .

Add 3 to the result.

Multiply $0.2 \times 1$ .

Subtract 3 from the result.

Multiply $4.5 \times 1$ .

Add 3 to the result.

Multiply $\frac{1}{2} \times 1$ .

Subtract 3 from the result.

Multiply $2 \times 1$ .

Add 0.5 to the result.

Multiply $2 \times \frac{3}{2}$ .

Add 3 to the result.

Multiply $2 \times \frac{5}{2}$ .

Add $\frac{7}{8}$ to the result.

Multiply $-3 \times 1$ .

Subtract 3 from the result.

Multiply $2 \times 100$ .

Add 3 to the result.

Still stuck on this one?

More Mathematics Questions

Solve the following mental maths problems. Show your working out.

Step-by-step solution

Multiply 2×12 \times 12×1.

Add 3 to the result.

Multiply 2×(−1)2 \times (-1)2×(−1).

Add 3 to the result.

Multiply 0.2×10.2 \times 10.2×1.

Subtract 3 from the result.

Multiply 4.5×14.5 \times 14.5×1.

Add 3 to the result.

Multiply 12×1\frac{1}{2} \times 121​×1.

Subtract 3 from the result.

Multiply 2×12 \times 12×1.

Add 0.5 to the result.

Multiply 2×322 \times \frac{3}{2}2×23​.

Add 3 to the result.

Multiply 2×522 \times \frac{5}{2}2×25​.

Add 78\frac{7}{8}87​ to the result.

Multiply −3×1-3 \times 1−3×1.

Subtract 3 from the result.

Multiply 2×1002 \times 1002×100.

Add 3 to the result.

Still stuck on this one?

More Mathematics Questions

Multiply $2 \times 1$ .

Multiply $2 \times (-1)$ .

Multiply $0.2 \times 1$ .

Multiply $4.5 \times 1$ .

Multiply $\frac{1}{2} \times 1$ .

Multiply $2 \times 1$ .

Multiply $2 \times \frac{3}{2}$ .

Multiply $2 \times \frac{5}{2}$ .

Add $\frac{7}{8}$ to the result.

Multiply $-3 \times 1$ .

Multiply $2 \times 100$ .