1. Solve the sums. You can use the method of your choice. of your own choos Example 1: 278 467 + 197 539 = 200 000 + 100 000 + 70 000 + 90 000 + 8 000 + 7 000 + 400 +500 + 60+30+7+9 = 300 000 + 160 000 + 15 000 + 900 + 90 + 16 = 300 000 + 100 000 + 60 000 + 10 000 + 5000 + 900 + 90 + 10 +6 = 400 000 + 70 000 + 5 000 + 900 + 100 + 6 = 400 000 + 70 000 + 5 000 + 1000+ 6 = 400 000 + 70 000 + 6 000 + 6 = 476.006 Example 2: Example 3: 2784 67 + 1975 39 1 6 (7+9) 90 900 15000 1 6 0000 3 0 0000 4 7 6006 (60+30) (400+500) (8 000 + 7 000) (70 000+90 000) (200 000+100 000) + 1 1 1 1 3 2 214 7 8 4 67 9 4 7 7 5 39 600 6