Decimals (Subtraction): แบบฝึกหัด

Solve the following: \( 7.42 + 0.9 - 3.15 \).

Subtract \(15.75\) from \(20\).

The weight of an empty box is \( 0.45 \text{ kg} \). When filled with apples, the total weight is \( 5.2 \text{ kg} \). If \( 1.75 \text{ kg} \) of apples are removed, what is the new total weight of the box and the remaining apples?

What is the result of \( 100 - 34.25 \)?

A ribbon is \(5.45\) m long. If Mary cuts away \(1.8\) m, how much ribbon is left?

Subtract \( 6.84 \) from \( 14.2 \).

Find the value of \( 36.4 - 9.18 \).

A roll of fabric was \( 30 \text{ m} \) long. A tailor used \( 8.75 \text{ m} \) on Monday and \( 3.6 \text{ m} \) more than Monday's amount on Tuesday. How many metres of fabric remained after Tuesday?

Mr. Chan had a spool of electrical wire that was \( 50 \) m long. He used \( 12.45 \) m to fix a light and \( 18.7 \) m to install a power socket.

a) What is the total length of wire Mr. Chan used in metres?

b) How many metres of wire were left on the spool?

A scientist has \( 5 \) litres of a chemical solution. In the first experiment, she uses \( 1.28 \) L. In the second experiment, she uses \( 0.75 \) L more than she did in the first experiment.

a) How many litres of the solution did she use in the second experiment?

b) How many litres of the solution remain after both experiments?