Did I do the following four problems right?
1. (5 x 104) – (3 x 103)
(50 x 103) – (3 x 103)
50 – 3 =47
47 x 103
47/10= 4.7
4.7 x 102
2. (1.25 x 103) + (4.25 x 102)
(12.5 x 102) + (4.25 x 102)
12.5 +4.25
16.75 x 102
16.75/10 = 1.675
1.675 x 101
3. (4.3 x 105) + (2.1 x 102)
(430 x 102) + (2.1 x 102)
430 x 102 =43,000
4.1 x 105 = 430,000
(43,000) + (430,000)
473,000
473,000/100,000 =4.73
4.73 x 105
4. 630,000 = 630,000/100,000=0.63 6.3 x 105
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