Obliczamy:

$10\cdot 5=50$  

$400\cdot 2=800$

$300\cdot 3=900$

$100\cdot 6=600$

$3\cdot 200=600$

$16\cdot 10=160$

$8\cdot 100=800$

$10\cdot 40=400$

$99\cdot 10=990$

$45\cdot 10=450$

$10\cdot 32=320$

$55\cdot 10=550$