A) 4 x 10'4+8 x 10'3+7
1. 10'4 = 10 x 10 x 10 x 10 = 10000
2. 10'3 = 10 x 10 x 10 = 1000
3. 4 x 10000= 40000
4. 8 x 1000 = 8000
5. 8000 + 40000 = 48000
6. 48007
B)2x 10'5+9x10'2+5
1.10'5= 10 x 10 x 10 x 10 x 10 = 100000
2. 10'2= 10 x 10 = 100
3.2 x 100000 = 200000
4.9 x 100 = 900
5.200000+ 900 = 200900
