Answer:
Check your work with an adult or friend!

Answer:
11cm + 35cm + 21.5cm + 9.5cm = 77cm

Answer:

a) 12,546mm, 1,254.6cm, 12.546m

b) 333,000mm ,33,300cm, 333m

c) 577mm, 57.7cm, 0.577m

d) 23,987,000mm , 2,398,700cm ,23,987m