1)
[tex] 9\times 10 {}^{2} + 5 \times 10 = 950[/tex]
[tex]3 \times 10 ^{4} + 2 \times 10 {}^{3} + 1 \times 10 {}^{0} = 32001[/tex]
2)
[tex]8 \times 10 {}^{5} + 7 \times 10 {}^{4} + 9 = 870009[/tex]
[tex]4 \times 10 ^{2} + 3 \times 10 {}^{3} + 5 \times 10 = 3450 [/tex]
3) a)
[tex]10210 \times 3 \times 10 = 306300[/tex]
b)
[tex]3615 \times 4 = 14460[/tex]