Subtraction

Becoming fast at subtracting numbers with decimal points is an excellent way to keep your personal budget accurate.

This topic teaches how to take one decimal number away from another, emphasizing how to use placeholder zeros when the numbers have different lengths. You will work through equations like subtracting 2.15 from 5.8, discovering how these skills apply directly to real-world scenarios like tracking fuel mileage, subtracting discounts at a store counter, or calculating changes in weight. It gives you the toolset needed to avoid mathematical errors when dealing with exact values.

Polishing your subtraction skills is simple with our mobile-friendly quiz design. Each session is structured to take about five minutes, allowing you to fit a quick mental workout into any part of your day. You can reset and repeat any quiz as often as you want to ensure the rules stay clear in your mind.

Computers do not actually subtract numbers the way humans do; instead, they convert numbers into binary code and perform a process called radix complement addition. This means your phone performs an incredibly fast addition step behind the scenes just to subtract a decimal value like 0.99 from a price.

1. Hundredths

Work on subtracting decimals to two places, the hundredths, across this 12-question quiz. You will tackle differences such as 0.64 - 0.19 = ? and 54.25 - 4.07 = ?, plus a couple of true or false items to verify. Borrowing is the main thing to watch here, especially when the top number has a smaller digit in the hundredths column than the one below it. Lining everything up by place value, then borrowing as needed, keeps the whole process tidy and far less error-prone. Recommended level: beginner to intermediate.

score: 96% (everyone) 12 questions

2. Tenths

This 12-question quiz practices subtracting decimals at the tenths place, a solid first step into decimal subtraction. You will solve differences like 1.0 - 0.2 = ? and 8.7 - 6.6 = ?, with a few true or false statements thrown in to keep you alert. As with adding, the golden rule is to stack the decimal points so each digit sits over its matching place before you subtract. Some problems need a little borrowing across the decimal point, which is the part most worth slowing down for. Recommended level: beginner.

score: 100% (everyone) 12 questions

3. Thousandths

This 12-question quiz takes decimal subtraction out to the thousandths place, with numbers ranging up into the hundreds. Expect problems like 10.240 - 1.477 = ? and 78.302 - 3.267 = ?, along with a few true or false checks. With three places after the point, borrowing can chain through several columns at once, so working steadily from right to left is the safest approach. It also helps to add trailing zeros so both numbers have the same number of decimal places before you start. Recommended level: intermediate.

score: 100% (everyone) 12 questions