Next, let me share some skills.
Use the multiplication formulas of 3×8=24, 4×6=24 and 2× 12=24 skillfully, that is, multiply the cards in hand by 3 and 8, 4 and 6, 2 and 12.
For example, when the number of cards is 4, 12, 2, 8, parents can guide their children to use the multiplication "4×6? =? 24 "or" 2× 12=24 ". That is, "4, 12,2,8" can be combined in the following form:12× (8-4-2) =12× 2 = 24 or 4× (12-8+2) =
Addition and subtraction: (25- 1=24, 27-3=24, 28-4=24, 30-6=24)
Try to make up the four numbers on the card face into the minuend and the minuend of the above subtraction.
Use the operational characteristics of 0, 1 1 to solve it.
For example, 3, 4, 4 and 8 can form 3× 8+4-4 = 24. For another example, 4,5, j and k can form11× (5-4)+13 = 24 and so on.