21. -1 * (-5)
22. -10 * (-10)
23. -3 * 4
24. 3 * (-2)
25. -19 * (-7)
26. 2 * (-2)
27. 20 * (-20)
28. -1 * (-10)
29. -3 * (-5) * 5
30. -3 * (-15) * 0
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You'll find some Basic Multiplication sums in this thread. None of them are particularly taxing - Just some easy ones to start off with.