Brand: Carson Dellosa
A great hands on and self checking tool for exploring number facts and investigating place value. The pupil places the window on the grid with the option to predict 1 more, 1 less, 10 more or 10 less. After making their prediction they can self check the answer by either lifting the flap to reveal the number or moving the grid one square in the direction they are calculating. Each pack includes 30 Grid Boards and 30 Windows. Each hundreds boards measures 12 x 14.25cm.