Maths We are going to look at formal methods of addition for 4 and 5 digit numbers. Use the slides below as reminders: Look down the additions. Decide which will have the largest answer. Make a note of it. Decide which will have the smallest answer. Make a note of it. Now find each total. Watch out! They do not all need column addition! 1. 4583 + 45,274 2. 8572 + 4782 + 5837 3. 6934 + 5047 + 8739 4. 86,489 + 76,431 5. 92,371 + 30,004 6. 45,273 + 23,542 + 13,258 7. 45,624 + 57,432 + 9467 8. 5632 + 3789 + 2745 + 3846 Are you ready for an adding challenge? Have a go at this investigation, you will need to persevere to find the answer. Write any addition of three 4-digit numbers where the answer is between 28,550 and 28,650. Can you find solutions: • that use all digits 0 to 9 at least once; • where no digit 0 to 9 is used more than twice; • that use the same number three ti...