➕MATHEMATICAL SKILLS➖ 1️⃣ NUMBERS 1️⃣ Gelman & Gallistel (1975) One - one principle: One counting word for each item (1=⬛/2️⃣ /3️⃣) Stable - order principle: The list of words must be consistent in order (1 - 2 - 3 - 4) Cardinal principle: The final word tell us how many they are (⬛⬛⬛= 3 ) Abstraction principle: You can count any collection of objects whether real or imaginary Order irrelevance principle: It doesn't matter what order but you have to count each object only once. You will get the same result (1️⃣2️⃣3️⃣4️⃣=4️⃣3️⃣2️⃣1️⃣) ✅ADVANTAGES OF WORKING WITH MANIPULATIVE MATERIAL ✅ Recreate situations exercise logical abilities They adapt to the rhythm They are attractive They cause dialogue between educator/parents and child