Decimal Practice
20 questions · 60 seconds · vertical format
Free · no login · instant feedback on every answer
Sharpen decimal addition and subtraction with 20 vertically-formatted questions in tenths — numbers like 4.8 and 12.3 — that reward one habit above all: lining up the decimal point. The game shows problems the way they should be written on paper, so the place-value alignment skill transfers directly.
Decimals are where place value earns its keep — students who treat 4.8 + 3.1 as "48 + 31" reveal a gap this drill closes. Instant feedback catches alignment errors on the spot, before they harden into habits that follow students into money math and measurement.
Tips That Make It Stick
- Line up the point. Write problems so the decimal points stack vertically — then add or subtract exactly like whole numbers, bringing the point straight down.
- Tenths work like ones. For 4.8 + 3.1, add 48 + 31 = 79, then place the point: 7.9. Once the points are aligned, decimal arithmetic is whole-number arithmetic.
- Estimate with whole numbers. 4.8 + 3.1 is roughly 5 + 3 = 8 — so 7.9 is plausible and 79 is not. A one-second estimate catches point-placement errors.
Frequently Asked Questions
What is the most common mistake when adding decimals?
Misaligning the decimal points — adding digits from different place-value columns. Writing problems vertically with the points stacked prevents it (and when decimal lengths differ on paper, padding the shorter number with zeros helps too).
What grade works with decimal operations?
Decimal addition and subtraction begin in 4th and 5th grade, with all four decimal operations expected by 6th grade. This drill matches the 4th-6th grade range.
Does this game include multiplying decimals?
This preset drills addition and subtraction, where alignment skills are built. You can enable decimal multiplication and division in game settings after loading the game.
📝 Matching Printable Worksheets
Prefer paper practice? These free PDF worksheets cover the same skill — each includes an answer key: