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.
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You're on a roll — here are the solutions for the "Friday: Revision Exercise": 1. 8 m 62 cm - 5 m 50 cm Step 1: Subtract the centimeters. 62 cm - 50 cm = 12 cm Step 2: Subtract the meters. 8 m - 5 m = 3 m The result is 3 m 12 cm. The correct option is (a). (a) 3 m 12 cm 2. 7 m 39 cm - 4 m 16 cm Step 1: Subtract the centimeters. 39 cm - 16 cm = 23 cm Step 2: Subtract the meters. 7 m - 4 m = 3 m The result is 3 m 23 cm. The correct option is (b). (b) 3 m 23 cm 3. 7 m 84 cm - 5 m 67 cm Step 1: Subtract the centimeters. 84 cm - 67 cm = 17 cm Step 2: Subtract the meters. 7 m - 5 m = 2 m The result is 2 m 17 cm. The correct option is (b). (b) 2 m 17 cm 4. 79 m 49 cm - 59 m 67 cm Step 1: Since 49 cm < 67 cm, borrow 1 m (which is 100 cm) from the meters. 79 m becomes 78 m 49 cm becomes 49 cm + 100 cm = 149 cm Step 2: Subtract the centimeters. 149 cm - 67 cm = 82 cm Step 3: Subtract the meters. 78 m - 59 m = 19 m The result is 19 m 82 cm. The correct option is (a). (a) 19 m 82 cm 5. 2 m 96 cm - 1 m 85 cm Step 1: Subtract the centimeters. 96 cm - 85 cm = 11 cm Step 2: Subtract the meters. 2 m - 1 m = 1 m The result is 1 m 11 cm. The correct option is (b). (b) 1 m 11 cm 6. A table 4 m 36 cm long is joined to another 2 m 75 cm long. What is the total length of the new table? Step 1: Add the centimeters. 36 cm + 75 cm = 111 cm Step 2: Convert 111 cm to meters and centimeters. 111 cm = 1 m 11 cm Step 3: Add the meters, including the carry-over from centimeters. 4 m + 2 m + 1 m = 7 m The total length is 7 m 11 cm. The correct option is (a). (a) 7 m 11 cm 7. 17 m 36 cm - 9 m 24 cm Step 1: Subtract the centimeters. 36 cm - 24 cm = 12 cm Step 2: Subtract the meters. 17 m - 9 m = 8 m The result is 8 m 12 cm. The correct option is (b). (b) 8 m 12 cm What's next?