Bigger numbers and reasoning
"Ready for a real challenge?" grins Biscuit. "These big numbers will make your brain stretch — explain your thinking as you go."
1. Write in words: a) 46 309 b) 80 070
2. What is the value of the 5 in each? a) 55 200 b) 50 418
3. Use the digits 6, 3, 0, 9, 1 once each. Write the largest and smallest five-digit numbers. Explain how you decided.
4. Biscuit's pile has 24 thousands, 18 hundreds, 5 tens and 12 ones. After trading up, what number is it? (Careful — some columns have more than 9!)
5. I am a number between 30 000 and 40 000. My tens digit is double my ones digit, and all my other digits are 0. Write two numbers I could be.