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When we count, every number is one more than the number before it. So the number just after 39 is 40, and the number just before 40 is 39. A two-digit number is made of tens and ones: 4 tens and 7 ones make 47.
✓ You passed this lesson’s test.
Count on, count back — “one more comes just after a number, one less comes just before it”
Use it for: Counting things at home, reading page numbers, and the numbers chapter of Class 1 maths.
Check: 40 − 1 = 39, so 39 comes just before 40 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🔢 Hundred Hopper badge when you pass — and a certificate when you finish all 8 lessons of Part 1 · Class 1. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
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