KalkoMaths Games for Kids

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The parental gate: what it protects and why it asks for a number in words

Apple requires apps for children to put anything that leaves the child's experience behind a gate. Ours asks you to type "eight hundred forty-five" as digits — and there is a reason it is not a sum.

Reading time: 3 min · Updated September 2026

What sits behind the gate

  • Settings — the learning range (tables to 10 or 12), haptic feedback, replaying the onboarding.
  • Outgoing links — the website, the privacy policy, the terms, and the Rate us link that opens the App Store.
  • The reset zone — wiping progress. The one button a seven-year-old should never find by accident.

Why a number in words and not a sum

A lot of kids' apps gate with a multiplication: "solve 7 × 8 to continue". In a maths app that is a joke — the child has just spent a week learning exactly that. A number written in words is different: reading and converting "eight hundred forty-five" needs a reading level that most children under eight do not have, and the number changes every time, so it cannot be memorised from watching a parent once.

Using the gate in Kalko

You will meet it the first time you tap the settings cog on the profile screen.

  1. Tap the profile icon, then the cog. The Ask a grown-up sheet appears with a number in words.
  2. Type it in digits. "eight hundred forty-five" → 845. The field accepts digits only.
  3. Change what you need. Learning range 1–10 or 1–12, haptics on or off, replay the three welcome screens.
  4. Close the sheet. The gate closes with it; the next visit asks again with a new number.

The gate appears every time on purpose. A gate that stays open for ten minutes is a gate a child can walk through after you put the phone down.

Download on the App Store

Tips

  • Read the number out loud when you type it — for a nine-year-old that is a mini number-words lesson, and they still cannot reproduce it next time.
  • Rating the app is behind the gate too, so a review is always from an adult.

Questions about the gate

Can my child change the learning range?

Not without reading a number in words and typing it. Practically, that means a parent does it.

Can the gate be disabled?

No. It is required for the Kids category and it protects the reset button.

Kalko app icon: a rocket lifting off among +, −, × and ÷ blocks

Five minutes a day. Paid once.

No subscription, no ads, no account, no data collected. Times tables and mental maths for 6–11 year olds, on iPhone.

Download on the App Store

One-time purchase · Family Sharing · Works offline