Column addition 5: Wriggling Worms
Spot the Mistake!
Someone has made a mistake in their column addition. Can you explain the mistake to your talk partner?
Did you know?
Worms eat soil. Their nutrition comes from the things in the soil such as dead plant material, fruits and vegetables. Accidently, they swallow millions of micro-organisms that live in the soil such as nematodes and protozoa.
Use PAWS and column addition to solve the following word problem.
On its way to a compost bin, a large earthworm swallowed 22,348 micro-organisms as soil passed through its gut. Once it was in the compost bin, it swallowed 28,361 micro-organisms on day one, 23,256 micro-organisms on day two and 19,049 micro-organisms on day three.
How many micro-organisms did the earthworm swallow in total on days one and three?
