Hundred Grid – find the shapes and write down their numbers
Shaded shapes on a hundred grid, with only a few numbers as help. The task: work out the field numbers of the shaded boxes. Free as a PDF with an answer sheet.
How it works & FAQHow the hundred grid works
Each grid has ten by ten fields, numbered row by row from 1 to 100. Only a few numbers are filled in. A shape of three to five boxes is shaded, and its field numbers have to be written down.
To find them, count on from the helper numbers: one more to the right, ten more downwards. That practises numbers up to 100 and spatial orientation together.
Who is the hundred grid for?
In memory training and activity groups it is a number exercise that needs no real calculating.
In elementary school it reinforces how the hundreds chart is built.
Adjusting the difficulty
Fewer helper numbers mean longer counting. Smaller shapes with three boxes are good to start with.
The example grid shows the numbers of the first row and a finished answer.
Your worksheet in five steps
- Choose the shape size: three, four or five boxes.
- Set the number of helper numbers.
- If you like, adjust the number of grids, the example grid and the shading.
- Click “Mix again” for new shapes.
- Download the PDF, with the answer sheet if you like.
Frequently asked questions
Is the hundred grid free?
Yes. All worksheets on Demti are free and work without signing up. You may print and copy them at home, in groups and in the classroom.
What are pentominoes?
Shapes made of five connected boxes. Demti uses all of them, including rotations and mirror images.
Does the sheet work on a black-and-white printer?
Yes. The “Grey” shading is the default and is easy to see without colour.
How do I check the answers?
Add the answer sheet. It lists the numbers you are looking for under each grid.