Why does the frog only jump by 1 and 5?

Because those two sizes are what early arithmetic is built on. Fives are how children first count something other than one at a time, and they lead straight into tens. Offering every jump size would let a child land the frog in one press and skip the thinking.

My child overshoots and hops back. Should I stop them?

No, it is a good sign. Overshooting and correcting means your child estimated first and adjusted second, which is how flexible mental math works. The ones to watch are the children who never overshoot because they only ever press +1.

What is a number line for, if my child can already count?

It turns counting into distance, which reciting cannot do. On a line a child sees that 3 and 8 are five apart, that 15 sits nearer 20 than 10, and that adding moves you right. Those pictures are what later strategies quietly rest on.

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Number Line Jump

Land the frog on the right number.

Grades K-2 · Counting on, number order, and adding on a line

How to play

1A target number lights up at the end of the line.
2Tap where you think it lands, or use the jump buttons to hop there.
3Each jump is one step. Count the hops out loud.
4Land exactly on the target to score.

Try a few

The frog starts on 0. The target is 13.
Answer: +5, +5, +1, +1, +1
Two big hops carry the frog to 10, because five and five make ten. Three single hops finish it: 11, 12, 13. The frog is not on five after the first press, it is on the number it landed on, and saying that number aloud each time is the whole exercise.
The frog is on 17. The target is 15.
Answer: -1, -1
Overshooting is normal and the grey buttons exist for it. The frog steps back from where it stands rather than restarting: 17 back one is 16, back one more is 15. Going back two to fix an overshoot of two is subtraction arriving early.
Land the frog on 18 in as few hops as you can.
Answer: Six hops: +5, +5, +5, +1, +1, +1
Three fives make 15 and three ones finish the job. Eighteen presses of +1 also lands on 18, just slowly. Asking for a shorter route is what pushes a child from counting one at a time toward counting in fives.

Why this game helps

A child can often recite "one, two, three" long before they understand that each number is one step further along than the one before it. That gap shows up the moment you ask them to start counting from six instead of one, or to say what is one more than a number without counting up from the start. The number line makes counting a movement through space, so adding becomes hopping forward and the distance between numbers becomes something you can see. That picture is the foundation every later strategy, from making ten to subtraction, is built on.

If your child finds this hard

The mistake to listen for is a child who presses +5 and then says "five" while the frog stands on 10. Teachers call this confusing the size of the jump with where it ends, and it is easy to miss because nothing went wrong with their hands. Fix it with words, not more rounds: narrate each press as a sentence holding two numbers. The frog was on 5, it jumped 5, now it is on 10.

A younger child often counts the tick they are standing on as their first step, so a jump of five from 0 lands on 4 in their head and the frog looks like it cheated. The cure is to count gaps instead of numbers. Run a finger along the line and count the spaces between marks aloud, so the counting words land on hops rather than labels.

If your child only ever presses +1, that is not something to correct mid-round. Counting by ones is how everyone begins, and the line exists to make it visible. Try racing: you take one turn, they take the next, fewer presses wins. Wanting to win is usually enough to make a child reach for the +5 button.

Common questions

Why does the frog only jump by 1 and 5?: Because those two sizes are what early arithmetic is built on. Fives are how children first count something other than one at a time, and they lead straight into tens. Offering every jump size would let a child land the frog in one press and skip the thinking.
My child overshoots and hops back. Should I stop them?: No, it is a good sign. Overshooting and correcting means your child estimated first and adjusted second, which is how flexible mental math works. The ones to watch are the children who never overshoot because they only ever press +1.
What is a number line for, if my child can already count?: It turns counting into distance, which reciting cannot do. On a line a child sees that 3 and 8 are five apart, that 15 sits nearer 20 than 10, and that adding moves you right. Those pictures are what later strategies quietly rest on.

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