Subtract Across Zeros
Zero Post
Run a woodland parcel post office by regrouping hundreds into tens and tens into ones. Pack orders such as 500 − 237 and 403 − 168, then see the parcels left and check the subtraction by counting up.
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How to play Zero Post
- 1
Exchange
Read the subtraction. If a shelf is empty, exchange a larger parcel for ten smaller parcels.
- 2
Pack
Tap individual parcels until the order has the requested hundreds, tens, and ones. Every parcel you pack leaves its shelf.
- 3
Send order
Choose Send order. The parcels left show the difference. Count up to check, then choose Next order. Complete eight deliveries and choose Play again.
Key Features
Exchange real parcels
Use Exchange 1 hundred → 10 tens and Exchange 1 ten → 10 ones to regroup without changing the total.
Pack and send
Tap the parcel pieces to pack the requested hundreds, tens, and ones, then choose Send order.
Eight deliveries
Solve eight orders, build a streak, and beat your best score. Undo and Reset order let you explore freely.
Frequently Asked Questions
How does 500 − 237 work?
Exchange a hundred for ten tens, then a ten for ten ones. You now have 4 hundreds, 9 tens, and 10 ones. Pack 2 hundreds, 3 tens, and 7 ones. There are 263 left.
Can I use a keyboard?
Yes. Tab to parcels and exchange buttons and press Enter or Space. Every game action is also available as a touch target.
