calculo mental
__1. 2 centenas + 48 unidades X 10A. 500
__2. 4 centenas X 5 =B. 240
__3. 5 veces 100C. 174
__4. 5 X 8 X 10 =D. 125
__5. 12 X 20 =E. 30
__6. 12.5 X10 =F. 3000
__7. 15 X 10 + 100 X 5 =G. 2000
__8. 100 X 3 decenasH. 2480
__9. la cuarta parte de 120I. 400
__10. la mitad de 348J. 650
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