Video narration
You're beside a 5-by-4-metre floor and a square carpet, 3 metres on each side. The floor is 20 square metres; the carpet covers 9, leaving 11 square metres uncovered. A 12-by-10-metre plot is 120 square metres. Four corner beds, each 4 by 4 metres, cover 16 square metres apiece, 64 altogether. That leaves 56 square metres. A 500-by-200-metre plot is 100,000 square metres. Divide by 100: 1,000 units. At ₹8 each, tiling costs ₹8,000. A 100-by-50-metre grove is 5,000 square metres. At 25 square metres per tree, 5,000 divided by 25 gives a maximum of 200 trees. Understand the space, find the whole area, then what's used or needed. Add, subtract, multiply or divide; check your answer and units. Now you try: a 20-by-15-metre garden is 300 square metres. A square pond, 5 metres on each side, uses 25 square metres. How much remains for plants? [Pause.] 275 square metres.