Solve:
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We will use the substitution property to arrange the exercise a bit more comfortably, we will add parentheses to the addition operation:
We first solve the addition, from left to right:
And finally, we subtract:
2
\( 100+5-100+5 \)
Both methods work! Left to right: 3-4=-1, then -1+2=1, then 1+1=2. Grouping: (3+2+1)-4 = 6-4 = 2. Use whichever feels easier for you.
You can rearrange addition and subtraction using the commutative property, but be careful with signs! Think of subtraction as adding negative numbers: .
Take it slow! Write each operation clearly: 3-4 = -1, then -1+2 = 1, then 1+1 = 2. Breaking it into small steps prevents mistakes.
Yes! Add all the positive numbers (3+2+1=6), then subtract all the negative numbers (just 4 here). So 6-4=2. This grouping method is very helpful!
Work through the original problem step by step: 3-4+2+1. Going left to right: 3-4=-1, -1+2=1, 1+1=2. ✓ Your answer matches!
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