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II. Give the missing number in the equation below.
1.9+____= 7 + 9
2. (8 x____1 x 3 = 8x (2x3)
3. (5x4) Ⓡ0 =____x (40)
4.15 +____= 12 + 15
5. (5 + 6) + 4 = 5+ (____+4)​