Question

additional practice 9 - 4 solve two - step word problems: addition and subtraction another look! harry scores 394 points on level 1. loses 248 points on level 2. he then earns 138 points on level 3. how many points does harry have now? step 1 find the hidden question. hidden question: how many points did harry have left after he lost 248 points? harry had 394 - 248 = 146 points left. step 2 use the answer to the hidden question to answer the original question. original question: how many points does harry have now? p = 146 + 138 p = 284 harry has 284 points now. 1. khalil has 875 building pieces in all. he gives his castle set to a friend. khalil then buys the helicopter set. how many building pieces does khalil have now? (in 1, draw bar diagrams and write equations to solve.) 2. how can you estimate to check if your answer is reasonable? explain.

Explanation:

For Problem 1:

Step1: Find given values

Total pieces: $875$, given away: $237$

Step2: Calculate remaining pieces

$875 - 237 = 638$

Step3: Add new set pieces

$638 + 229 = 867$

1. Estimation method: Round each number to the nearest hundred: $875 \approx 900$, $237 \approx 200$, $229 \approx 200$. Calculate $900 - 200 + 200 = 900$.
2. Check reasonability: The exact answer (867) is close to the estimated value (900), so the answer is reasonable. The small difference comes from rounding the original numbers.

Step1: Reverse the point loss

$394 - 248 = 146$

Step2: Add Level 3 points

$146 + 138 = 284$

Answer:

Chidi has 867 building pieces now.

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For Problem 2: