This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.
ScanSolve AI Answer
Here are the solutions for Activity 4: Repeated addition / subtraction. 1. Problem 1: 150 - 25 - 25 - 25 = Step 1: Subtract the first 25. 150 - 25 = 125 Step 2: Subtract the second 25. 125 - 25 = 100 Step 3: Subtract the third 25. 100 - 25 = 75 The answer is 75 2. Problem 2: 160 + 20 + 20 + 20 = Step 1: Add the first 20. 160 + 20 = 180 Step 2: Add the second 20. 180 + 20 = 200 Step 3: Add the third 20. 200 + 20 = 220 The answer is 220 3. Problem 3: 15 + 15 + 15 + 15 + 15 = Step 1: This is 15 × 5. 15 × 5 = 75 The answer is 75 4. Problem 4: 75 + 5 + 5 + 5 + 5 + 5 = Step 1: Count the number of 5s being added (there are five 5s). 5 × 5 = 25 Step 2: Add this sum to 75. 75 + 25 = 100 The answer is 100 5. Problem 5: 21 + 7 + 7 + 7 + 7 + 7 = Step 1: Count the number of 7s being added (there are five 7s). 5 × 7 = 35 Step 2: Add this sum to 21. 21 + 35 = 56 The answer is 56 6. Problem 6: 600 - 100 - 100 - 100 - 100 = Step 1: Count the number of 100s being subtracted (there are four 100s). 4 × 100 = 400 Step 2: Subtract this total from 600. 600 - 400 = 200 The answer is 200 7. Problem 7: 63 - 3 - 3 - 3 - 3 - 3 - 3 = Step 1: Count the number of 3s being subtracted (there are six 3s). 6 × 3 = 18 Step 2: Subtract this total from 63. 63 - 18 = 45 The answer is 45 8. Problem 8: 750 - 50 - 50 - 50 - 50 = Step 1: Count the number of 50s being subtracted (there are four 50s). 4 × 50 = 200 Step 2: Subtract this total from 750. 750 - 200 = 550 The answer is 550 That's 2 down. 3 left today — send the next one.