Chapter 1 and 2

solve the following

$$\left(51-48\right)+7^2\times3$$

solve the following

$$9-15\div\sqrt[]{25}\times3$$

Round off 3 409 725 to

to the nearest 10000

(a)  

Round off 78.4695 to

the nearest whole number

(a)  

Estimate the sum by rounding each number to the nearest hundred.

$$2010+2001+1984$$

Round off 508 754 to the nearest ten thousand

Convert the fraction

$$5\frac{3}{20}$$  to a percent

Davos is a cleaner. The table shows information about the time it will take him to clean each of the four rooms in a house.

What is the total (in minutes) taken by Davos to complete the cleaning?

Davos wants to clean all four rooms in one day. He will have breaks for a total time of 75 minutes. Davos is going to start cleaning at 9 am.

Will he finish cleaning by 4 pm?

Daniel bakes 420 cakes. He bakes only vanilla cakes, banana cakes, lemon cakes and chocolate cakes.   $$\frac{2}{7}$$ of the cakes are vanilla cakes. 35% of the cakes are banana cakes.

Work out the number of lemon cakes Daniel bakes.