Addition and Subtraction of Two Digit Numbers

If the sum is $45$, to find the express of sum of three given numbers.

If the required answer is $\mathrm{A}+22+12$, find the value of $\mathrm{A}$.

If the sum is $58$, to find the express of sum of three given numbers.

If the required answer is $\mathrm{A}+24+12$, find the value of $\mathrm{A}$.

If the sum is $36$, to find the express of sum of three given numbers.

If the sum is $37$, to find the express of sum of three given numbers.

If the sum is $39$, to find the express of sum of three given numbers.

If the sum is $66$, to find the express of sum of two given numbers.

If the sum is $86$, to find the express of sum of two given numbers.

If the required answer is $\mathrm{A}+42$, find the value of $\mathrm{A}$.

If the sum is $58$, to find the express of sum of two given numbers.

If the required answer is $\mathrm{A}+43$, find the value of $\mathrm{A}$.

If the sum is $79$, to find the express of sum of two given numbers.

If the sum is $88$, to find the express of sum of two given numbers.

This table shows the $10$ countries with the largest land areas. Their approximate populations are also shown.

If you subtract the total populations of three of the countries from China's population, the difference is still over $1$ billion $- 1 000 753 000$ . Which three countries are they?

$\underline{\begin{array}{cccc}& 4& 5& 9\\ -& & 2& 4\\ & & & \end{array}}$

Take $5$ tens $4$ ones from $92$, to get

On subtracting $18$ from $154$, we get

Subtract.

$7129-1000$

Subtract the numbers.

$2650-1385$

Melbourne and Sydney are large cities in Australia. In $2015$ , Melbourne's population was $4 529 496$ . Rounded to the nearest hundred thousand, Sydney's population was $400 000$ more. What was the population of Sydney in $2015$ , rounded to the nearest hundred thousand.

What's a human being made of? According to scientists, you, and all other people, are made up of a mixture of chemical substances, listen below:

• Phosphorous: $780$ g
• Sulphur: $140$ g
• Potassium: $125$ g
• Oxygen: $43000$ g
• Carbon: $16000$ g
• Hydrogen: $7000$ g
• Nitrogen: $1800$ g
• Calcium: $1200$ g
• Sodium: $100$ g
• Chlorine: $95$ g

Add the masses of all the substances to find the mass of an average adult. Convert the answer from grams to kilograms.

The number $100$ more than $97$ is _____.

The number $100$ more than $598$ is _____.