Three months, side by side: a sure cost and a maybe gain.
The big ideaA debt's extra is a sure cost. What a planted coin earns is only a maybe.
How it works
In the made-up town of Lantern Bay, Nia had twenty spare coins and owed Bea twenty coins, and Bea charged two extra coins every month.
Dov's orchard co-op said coins planted there grow about one coin a month, on average. Some months give more and some give less.
The debt's extra is a sure cost, because Bea charges it every month. The orchard's gain is a maybe, because an average is not a promise.
Other things matter too: a safety jar for surprises, whether the debt nags, and when coins are needed. Families weigh them differently.
What is sure and what is a maybe.
📜pay the debt🌳plant the coins🏺a safety jar
Two roads at the fork.
Example 1: The debt's extra
Bea charges 2 extra coins each month.
Over 3 months: 2 + 2 + 2 = 6 coins.
It is certain, because Bea charges it every month the debt stays.
Example 2: The orchard's average
Coins planted at the orchard grow about 1 coin a month, on average.
Over 3 months: 1 + 1 + 1 = 3 coins, on average.
It is only an average. Some months give more and some give less, and nobody can promise it, not even Dov.
Example 3: Side by side
The debt's extra is 6 coins, and it is sure.
The orchard's average gain is 3 coins, and it is a maybe.
The gap is 6 − 3 = 3 coins, but a sure number and a maybe number are different kinds of numbers.
Example 4: What else can matter
A safety jar for surprises.
Whether the debt nags.
When the coins are needed.
Families weigh these differently, and there is no single right answer.
Words to know
debt
Coins owed to someone else, here to Bea.
average
A middle number. It hides months that give more or less.
sure
Certain to happen, like a charge made every month.
maybe
It might happen, but nobody can promise it.
safety jar
A jar of coins kept for surprises.
Watch out
A sure cost and a maybe gain are different kinds of numbers. An average is not a promise.
Averages hide bumpy months. A climb on average still has down months.
A bigger number is not the whole story. A safety jar and when the coins are needed matter too.
There is no single right answer. Talk it over with a grown-up before choosing.
Try it
Bea charges 2 extra coins a month. How many extra coins in 3 months?
The orchard grows about 1 coin a month on average. About how many coins in 3 months?
Is the debt's extra sure or a maybe?
Is a great harvest year sure or a maybe?
Answers: 1. 6 · 2. 3, on average · 3. Sure · 4. A maybe
Try at homeWith a grown-up, talk about what a safety jar is for. What surprises might it cover, and why do families like having one?
For grown-upsThis compares two uses of pretend coins in a made-up town. It is not advice about any real money, product or plan. Ask your child what makes a number sure and what makes it a maybe, and let them say which road they would pick and why.
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