Math · Stage 1
Add and subtract two-digit numbers within 100 (bar model)
Add and take away two-digit numbers to 100 the smart way — split into tens and ones and draw the bar model.
✦ Math📘 Stage 1 · S1⏱ ~9 min🧒 Ages 5–6★ Free to start
I can add and subtract two-digit numbers within 100 using tens and ones and the bar model.
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Kavi's Market Stall 🍎
Kavi counts the fruit at the market stall: 34 red apples 🍎 and 23 green apples 🍏. "That's a lot to count one by one!" hoots Kavi. So Kavi draws a bar with two parts — 34 and 23 — adds the tens (30 + 20 = 50), then the ones (4 + 3 = 7). "57 apples in all — and I didn't count a single one twice!"
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What your child will learn
1Two parts, one wholeA bar model shows a whole split into two parts. Use ◀ less and more ▶ to change the split — the two parts always add back to the whole.
2Jump by tensTo add a two-digit number the fast way, jump the tens first. Each giant hop is +10 — a whole ten. Tap Hop +10 and watch Kavi leap 0 → 10 → 20 → 30.
3All the ways to split 20Here is every way to break 20 into two parts. Cover one part with your finger and say the other — that is the bar model in your head.
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A peek inside
Kavi has 34 red apples 🍎 and 23 green apples 🍏. How many apples in all?
tens 30 + 20 = 50 · ones 4 + 3 = 7 · 50 + 7 = 57
Try this at home: Add the tens, then the ones: 45 + 23 = __
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Math · Stage 1 · S1 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.