50 times longer.
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90 cm longer 1 meter = 100 centimeters 1 centimeter = 0.01 meter
about 38 cm longer
The first step in answering this question is to convert the metres value into cm. That makes the sum easier, and allows us to work with consistent units. There are 100cm in a m, so to convert from m to cm you have to multiply by 100. In this case, we have 0.5m, so multiply that by 100 to give 50cm. Therefore the question can be rewritten as how many cm is 50cm longer than 34cm. The answer is just 50-34 or 16cm.
450 cm
1m = 100cm so 100/2 = 50x longer