the result of 6 x 4 has been forgotten, he/she can get it by adding 6 + 6 + 6 + 6. but there are other tips also. if you remember that 6 x 3 = 18, you can perform the next procedure 6 x 4 = 6 x 3 + 6 = 18 + 6 = 24. or if you remember that 6 x 5 = 30, you can act so 6 x 4 = 6 x 5 - 6 = 30 - 6 = 24. to use these tips effectively, pupils have to master totally both the addition skills and the subtraction skills within the limits of 100.
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