3+-7=, 10, -10, -4, 4, −20+11, -9, -31, 8+3-15, 4, 26, -26, -4, -30-80+40, 70, -70, -9-3-1, -13, 13, 15-+25, 10, -10, -5--9, 4, -4, -14, 14, 40--40, 0, 80, -0, -80, 4×-15, 60, -60, -12×-12, 144, -144, -11×3, 33, -33, 5×-4×-7, 140, -140, -9×2×-2, -36, 36, (−2)², 4, -4, -42÷6, 7, -7, -8, 8, 100÷-4, -20, 25, 20, -25, -49÷-7, 7, -7, Write down the next two numbers in this number sequence 2, -6, 18, ......, ......., -54,162, -30,15, Write down the highest common factor (HCF) of 21 and 28, 9, 7, Find the Lowest Common Multiple (LCM) of: 6 and 7, 42, 54, 49, 36, 1, 48

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