New game
Download
SCORM download
To be used in an LMS (Moodle, Blackboard...)
Regular download
To be published on a website or blog.
Downloading games is an exclusive feature for users with an Academic Plan or a Commercial Plan.
Get your Academic Plan or your Commercial Plan now and start integrating your games into your LMS, website or blog.
Get Academic Plan
If you wish, you can download a demo game here and test its integration:
Share game
Riddle
Riddle

Regrouping Code Breaker

Integrate it into your platform
G. Classroom M. Teams
You can integrate the game into an LMS compatible with LTI 1.1 or LTI 1.3 such as Canvas, Moodle, or Blackboard. This way, the scores will be automatically saved into the platform’s gradebook.
Download
You have exceeded the maximum number of games you can integrate into Google Classroom with your current Plan.

To integrate as many games as you want in Google Classroom, you need an Academic Plan or a Commercial Plan.

Get Academic Plan
You have exceeded the maximum number of games you can integrate into Microsoft Teams with your current Plan.

To integrate as many games as you want in Microsoft Teams, you need an Academic Plan or a Commercial Plan.

Get Academic Plan
Downloading games is an exclusive feature for users with an Academic Plan or a Commercial Plan.

Get your Academic Plan or your Commercial Plan now and start integrating your games into your LMS, website or blog.

If you wish, you can download a demo game here and test its integration:

Get Academic Plan

Regrouping Code Breaker

Riddle

Played 0
Create copy

About this activity

Code-breaking maths puzzle

Created by

Hidden Author
Hidden Author
Lebanon

Download the paper version to play

Make your own free game from our game creator
Compete against your friends to see who gets the best score in this game
Make challenge

Top Games

 %
Anonymous
Anonymous
 %
%
%
You have exceeded the maximum number of games you can print with your current Plan.

To print as many games as you want, you need an Academic Plan or a Commercial Plan.

Get Academic Plan
Print your game
Regrouping Code Breaker
 

Regrouping Code BreakerOnline version

Code-breaking maths puzzle

by Hidden Author
1

Clue: 314 + 421 What is the sum?

Hints

Check that the final sum is 3 digits: hundreds, tens, ones.

Carry over when needed is allowed.

Add the hundreds, tens, and ones separately.

2

Clue: 621 − 195 What is the difference?

Hints

Ensure the result is within 0–999.

Borrow as needed from the next place value.

Subtract the ones, tens, then hundreds.

3

Clue: 689 − 296 What is the difference?

Hints

Result should be non-negative.

Borrow may be required.

Subtract from right to left.

4

Clue: 221 + 143 + 326 What is the total?

Hints

Final sum should be a three-digit number.

Group thousands not needed; keep track of carries.

Add all three numbers step by step.

5

Clue: Start at 19 on a number line. Jump backwards 11. Where do you land?

Hints

Count the starting point then subtract.

Move left on the line by 11 steps.

6

Clue: Start at 28. Move backwards 19. Where do you land?

Hints

Result is a single-digit number on the line.

Subtract 19 from 28.

7

Clue: 3 621 + 4 492 What is the answer?

Hints

Result may be written with a space or without.

Line up digits and add as usual.

Ignore the space; sum the two numbers.

8

Clue: 8 120 − 685 What is the answer?

Hints

Final number may include a comma-free form.

Align digits in place value columns.

Subtract 685 from 8120.

9

Clue: 524 − 366 What is the difference?

Hints

Result should be positive.

Borrow where necessary.

Subtract ones, tens, and hundreds.

10

Clue: I have 6 hundreds, 2 tens, and 1 one. What number am I?

Hints

Combine hundreds, tens, and ones into the 3-digit number.

Interpret the expanded form by place value.

 
Are you sure you want to leave the page?

If you leave, you will lose the game in progress.