The 100-envelope challenge requires numbering 100 envelopes from one to 100 and drawing one randomly every day. The number on the envelope drawn determines the amount of cash that must be saved. Getty Images
The 100-envelope challenge requires numbering 100 envelopes from one to 100 and drawing one randomly every day. The number on the envelope drawn determines the amount of cash that must be saved. GettyShow more

Try these six money-saving challenges that can pay off in the long term