Is Hopper's Number Line — Add & Subtract by Hopping (Grade 2) free to use?

Yes. Hopper's Number Line — Add & Subtract by Hopping (Grade 2) is completely free, with no signup and no paywall, on any tablet, laptop, or classroom whiteboard.

Which ages is this activity for?

It is designed for Grade 2 (Measurement & Data) and works well for whole-class, small-group, or independent practice.

Hopper's Number Line — Add & Subtract by Hopping (Grade 2)

Hopper the frog adds and subtracts by HOPPING along a number line of lily pads. Read each hop, then model it: put Hopper on the start, point the hop forward (to add) or back (to take away), pick the right hop size, and work out which number Hopper lands on. A warm Grade 2 game about representing sums and differences within 100 on a number-line diagram, aligned to Common Core 2.MD.B.6.

Grade 2·Measurement & Data·2.MD.B.6

About this activity

Hopper the frog adds and subtracts by hopping along a number line of lily pads — Hopper sits on 6 and hops forward 8, or sits on 80 and hops back 50 — and the child builds the move: place the start, point the hop forward to add or back to take away, choose the hop size, and find where Hopper lands. It's a free, interactive Grade 2 math activity that runs in the browser, with no account.

The big idea is representing a sum or difference as a jump on a number line, the model behind 2.MD.B.6. Because the child sets the direction and the size of the hop themselves, the number line stops being a picture to look at and becomes a tool they operate — and the decoy landing spots mean they have to track the actual jump, not guess a nearby number. The activity scales from hops of 2 and 3 up to hops of 10 across a line to 100.

It is aligned to Common Core 2.MD.B.6 — representing whole-number sums and differences within 100 on a number-line diagram. No timer, no score — just calm, playful practice.

What's inside this activity

Designed for Grade 2 learners (ages about 7–8)
Common Core strand: Measurement & Data
Aligned to Common Core standard 2.MD.B.6

How to play

Read Hopper's hop and place him on the starting lily pad.

Point the hop forward to add or back to take away, set the hop size, and find where he lands; then press Check.

Not quite? Try again as many times as you like — there is no timer and no score.

What your child practices

Showing addition as a forward hop and subtraction as a hop back
Choosing the correct hop size and starting point on the number line
Finding the landing number after a jump within 100
Reading a number line as a tool for computing, not just a picture

Learning goals

Represent sums and differences within 100 on a number-line diagram — the focus of Common Core 2.MD.B.6

Connect adding to forward jumps and subtracting to backward jumps

Build the number-line model that supports later mental math

Frequently asked questions

What does the Hopper's Number Line — Add & Subtract by Hopping (Grade 2) activity teach?: Hopper's Number Line — Add & Subtract by Hopping (Grade 2) is a free interactive activity for Grade 2, focused on Measurement & Data. Children play it right in the browser — no printing, login, or setup required.
Is Hopper's Number Line — Add & Subtract by Hopping (Grade 2) free to use?: Yes. Hopper's Number Line — Add & Subtract by Hopping (Grade 2) is completely free, with no signup and no paywall, on any tablet, laptop, or classroom whiteboard.
Which ages is this activity for?: It is designed for Grade 2 (Measurement & Data) and works well for whole-class, small-group, or independent practice.

Practice this standard

See all 2.MD.B.6 activities