Math · Stage 4
Read, write and round numbers to 100,000; find factors and multiples
Name the place of every digit up to ten-thousands, round big numbers to a friendly signpost, and see how factors and multiples are two sides of the same times-table.
✦ Math📘 Stage 4 · S4⏱ ~11 min🧒 Ages 8–9★ Free to start
I can read, write and round numbers to 100,000; find factors and multiples.
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Kavi's Big-Number Map 🗺️
Kavi counts 35,028 leaves in the Great Oak 🍂! "A big number isn't scary," he hoots. "Each digit has its own place — ten-thousands, thousands, hundreds, tens, ones. I can read it, round it to a friendly signpost, and spot its factors and multiples ⚡."
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What your child will learn
1Every digit has a placeA digit's value depends on its place. Build 325: the 3 is worth 3 hundreds = 300, the 2 is 2 tens = 20, the 5 is 5 ones = 5. Tap + and − to change each place and watch the number change.
2Round to the nearest ten-thousandThe big signposts up to 100,000 are the ten-thousands: 0, 10,000, 20,000, 30,000…. Every number sits between two signposts — rounding means hop to the closest one. Tap Hop +10000 to travel signpost to signpost.
3Multiples: count up in stepsA multiple of a number is any number you land on when you count up by it. The multiples of 6 are 6, 12, 18, 24, 30… — the times-table of 6. The lit numbers show the multiples of 6.
4Factors: numbers that divide evenlyA factor of a number divides it exactly, with nothing left over. Factors come in pairs that multiply to make the number. For 24: 1×24, 2×12, 3×8, 4×6. The lit numbers are the multiples of 4 — and because 4 × 6 = 24, both 4 and 6 are factors of 24.
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A peek inside
Write the number: 3 ten-thousands, 5 thousands, 0 hundreds, 2 tens, 8 ones.
30,000 + 5,000 + 0 + 20 + 8
Try this at home: Write the number: 4 ten-thousands, 2 thousands, 6 hundreds, 0 tens, 9 ones = __
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Math · Stage 4 · S4 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.