JUEVES 23: CÁLCULO MENTAL
Test
Suma 19, 29, 39..
Suma 199, 299, 399
Tienes que redondear a la decena o centena más cercana y luego restar 1:
24 + 29 = 24 + 30 = 54 -1 = 53
346 + 399 = 346 + 400 = 746 - 1 = 745
Suma 199, 299, 399
Tienes que redondear a la decena o centena más cercana y luego restar 1:
24 + 29 = 24 + 30 = 54 -1 = 53
346 + 399 = 346 + 400 = 746 - 1 = 745
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