Question

kai tries to find $203 + 427$. his work is shown.
in which step does kai make the first mistake?
step 1
step 2
step 3
step 4
kais work
step 1: $203 = 200 + 30 + 0$
step 2: $427 = 400 + 20 + 7$
step 3: $600 + 50 + 7$
step 4: the sum is 657.

Explanation:

Step1: Verify Step1 decomposition

$203 = 200 + 30 + 0$ is incorrect; correct decomposition: $203 = 200 + 0 + 3$

Step2: Verify Step2 decomposition

$427 = 400 + 20 + 7$ is correct

Step3: Identify first error

The first mistake occurs in Step 1, as the ones place of 203 is misrepresented.

Answer:

Step 1