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Learn to add and subtract and carry over using a simple method to understand the step between tens and units. The 8 boards are rewritable so you can practise as many times as you like, and the base includes a number line to make the calculations easier. It contains two systems to subtract and carry over by exchanging and equal addition. It includes a table to work on doubling numbers from 1 to 10 and decomposing the number 10. Now, adding and subtracting is easy and fun!
Ref: 30677
