Round It! follows the National Curriculum in England. Year 4 pupils are expected to "round any number to the nearest 10, 100 or 1,000". Year 3 builds the groundwork: placing 3-digit numbers on a number line and naming the previous and next multiple of 10 and 100.

How the app teaches

• Meaning before the rule. Children first find the two multiples either side, the halfway point, and which end is closer. The digit shortcut (0–4 round down, 5–9 round up) comes afterwards, on the Explore screen.
• Same order as White Rose and Oak National: nearest 10, then 100, then 1,000. After that, one number three ways (6,347 → 6,350, 6,300, 6,000) and real measures (2,800 g is about 3 kg).
• Support that fades. The first three questions in Levels 1–4 are split into two tap-to-answer steps. Later questions are typed, and the number line is available under "Show me the number line".
• 4-digit focus. Two separate sections for rounding 4-digit numbers, one to the nearest 100 and one to the nearest 1,000, with a place-value chart, in rounds of 10 with stars like the levels. The number line can be shown for support or hidden for a challenge; each section remembers the choice.
• No timers and nothing taken away. Stars count answers right first time: 9–10 gets 3 stars, 7–8 gets 2, and finishing always gets 1.

Common mistakes it looks out for

• Not changing every digit: 4,698 to the nearest 100 written as 4,798 instead of 4,700.
• Picking the wrong neighbour, or always rounding up.
• Rounding to the wrong place (to the nearest 100 when asked for the nearest 10).
• Rounding a halfway number down.
• Crossing a boundary: 95 → 100, 996 → 1,000, 9,960 → 10,000, and 4 → 0.
• Rounding in steps in the 4-digit sections: 4,480 → 4,500 → 5,000, when 4,480 is closer to 4,000.

Sources

• DfE National Curriculum: Mathematics, KS1 and KS2
• DfE Mathematics guidance: Year 3 and Year 4
• Oak National Academy: round a 4-digit number
• Why is rounding so hard?