Here are some rough metric/imperial equivalents that you should learn.
3 ft is approximately 1 m 5 miles is approximately 8 km 2 lbs is approximately 1 kg 1 oz is approximately 30 g 2 pints is approximately 1 litre
Example 1 Approximately how many grams are equivalent to 4 oz.
Answer
1 oz = 30g 4 oz = 4 × 30 = 120 g
Example 2 Approximately how many km are equivalent to 100 miles.
5 miles = 8 km 100 miles = 160 km (multiply each side by 20)
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