Play N Learn Maths Wrap Up Subtraction
Start the string with the 1st number on the left, read the large number in the center, find the correct answer on the right hand side and bring the string to the answer. (example 3+1). Then draw the string around the back to the next number on the left. Repeat this procedure until the whole exercise is completed. It has a self-correcting mechanism with answers at the back too. The next challenge would be to time yourself.
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