Add and remove decimal weights to settle your sub on an exact depth, down to the hundredth.
Was this fun?
How to play
A target depth is marked on the gauge and your submarine starts elsewhere. Apply weights of 1.0, 0.1 and 0.01 metres up or down to land exactly on the target. A place-value strip splits your current depth into ones, tenths and hundredths so you can see what each move changes.
Win the moment your depth matches the target precisely.
On medium and hard, a steady current nudges your depth every move, so you must plan ahead to cancel it.
Fewer moves and faster times score higher.
A Reset button returns the sub to its starting depth.
Controls
Desktop: click the + and − weight buttons, or use keys Q/W/E to add 1.0/0.1/0.01 and A/S/D to subtract.
Phone & tablet: tap the + and − weight buttons; tap the difficulty and mode selectors.
Game modes
Easy, Medium and Hard difficulties, each as a Daily seeded dive or endless Practice.
Tips & strategy
Close the largest gap first with ones, then refine with tenths and hundredths.
When a current is present, factor in its drift before each move so you do not overshoot.
Watch the place-value strip rather than the raw number to keep your decimals lined up.
What you'll learn
Decimal Dive teaches decimal place value and precise addition by trimming a submarine to exact depths, where every decimal place matters.
Skills: decimal place value, adding and subtracting decimals, precision, estimation
Best for: roughly grades 4–7 (ages 9–13)
For parents & teachers: makes decimal precision concrete and consequential.
About Decimal Dive
Decimal Dive is an original free browser game built for PlayPendium that teaches decimal place value and precise addition through a submarine-trimming challenge. Play free, no sign-up.
A free, original browser game on PlayPendium. No download, no install.
