Bigger sums and addition puzzles
"Big totals and tricky puzzles ahead," says Biscuit. "Show every step of your thinking!"
1. Add (watch the carrying): a) 3 847 + 2 696 = b) 5 678 + 4 539 =
2. The friends gathered 2 480, 1 975 and 3 060 gumnuts over three days. What is the total?
3. Find the missing number: 2 350 + □ = 6 000.
4. Use the digits 1, 2, 3, 4, 5, 6 once each to make two three-digit numbers with the largest possible total. Show your numbers and the total.
5. Biscuit says any two odd numbers always add to an even number. Test it with three examples and say whether you agree.