Quiz-Tree

Addition

Want to add numbers with decimal points without losing track of the place values? Adding decimals comes down to one habit, and this set of quizzes builds it until it feels automatic.

Adding Decimals from Tenths to Thousandths

The quizzes start gently, adding values at the tenths place like 0.7 + 0.2 = 0.9, then work out to the hundredths and thousandths and bring in bigger numbers along the way. You will mostly add pairs such as 0.49 + 0.91 = 1.40, with a few true or false items where you decide whether a sum is correct.

The whole skill rests on lining up the decimal points so each digit sits over its matching place. Once the columns are stacked, you add from the right and carry just like you would with whole numbers. These sets run from beginner to intermediate, so you can start wherever you feel comfortable. Spotting a sum that lands exactly on a whole number is a nice built-in check that your carrying went right.

Did You Know?

Adding small decimals can quietly push you past a whole number. Two values under one, like 0.49 + 0.91, still add up to more than 1, which is a good reminder to watch your carrying from the hundredths into the tenths.

A handy trick is to pad the shorter number with zeros. Writing 0.5 as 0.500 lets you line it up neatly with a value like 0.123 without changing its size at all.

How the Quizzes Work

Each quiz is short, about five minutes, and you can repeat any of the 6 sets as often as you like until the steps feel routine. Building the place-value habit early pays off in every decimal problem after this. Because the sets step up gradually, you can move from tenths to thousandths only when you are ready. Ready to add with confidence? Try the free interactive math quizzes and start at the level that suits you.

1. Adding Hundredths 1

This 12-question quiz moves decimal addition out to two places, the hundredths. You will mostly add pairs of values like 0.49 + 0.91 = ? and 0.64 + 0.89 = ?, with a handful of true or false items where you decide if a given sum is right. A small thing that trips people up is carrying from the hundredths into the tenths, so it pays to add the rightmost column first and work left. A couple of the answers come out to clean whole numbers, which is always a satisfying check. Recommended level: beginner to intermediate.

score: 86% (everyone)

2. Adding Hundredths 2

This 12-question quiz keeps decimal addition at the hundredths place but raises the stakes with bigger numbers, some past 80. Expect sums like 19.21 + 4.02 = ? and 46.17 + 5.61 = ?, plus a few true or false statements to judge. Bigger numbers do not change the approach at all; you still align the decimal points and add each column, carrying where needed. One false item hides a sneaky error in how the digits are placed, so reading the decimal point carefully really matters here. Recommended level: intermediate.

score: 85% (everyone)

3. Adding Tenths 1

This 12-question quiz is a gentle start to adding decimals, working only with numbers carried to the tenths place. Most items ask you to add two values, like 0.7 + 0.2 = ? and 0.8 + 0.7 = ?, and a few flip into true or false statements for you to check. The one habit that makes all of this easier is lining up the decimal points before you add, so the tenths sit right under the tenths. Some sums also cross over into whole numbers, which is a nice early reminder to watch your carrying. Recommended level: beginner.

score: 90% (everyone)

4. Adding Tenths 2

Here is a 12-question quiz that keeps adding to the tenths place but brings in larger numbers, some climbing into the tens. You will solve straightforward sums such as 22.0 + 3.1 = ? and 7.6 + 3.3 = ?, with a few true or false checks mixed in. Even with bigger figures, the method stays the same: keep the decimal points stacked in a straight line and add column by column. Watch for sums that land exactly on a whole number, since it is easy to drop the trailing zero by accident. Recommended level: beginner to intermediate.

score: 100% (everyone)

5. Adding Thousandths 1

This 12-question quiz takes decimal addition all the way out to three places, the thousandths. You will add values such as 0.025 + 0.079 = ? and 0.575 + 0.123 = ?, with a few true or false checks at the end. With three decimal places there is more room for a carry to ripple across columns, so it helps to add slowly from right to left. A nice surprise is that several of these sums tip just over 1, a good reminder that small numbers can still add up to more than a whole. Recommended level: intermediate.

score: 93% (everyone)

6. Adding Thousandths 2

This 11-question quiz keeps decimal addition at the thousandths place while pushing the numbers into the hundreds. You will work through sums like 128.684 + 10.254 = ? and 504.871 + 24.215 = ?, along with a few true or false items. The longer the number, the more it helps to keep every place value lined up, so writing the digits in neat columns saves a lot of mistakes. One of the false statements has too many digits after the point, a classic trap when you are adding thousandths. Recommended level: intermediate.

score: 100% (everyone)