Matemáticas mentales Worksheet
Recommended for 1er grado — 5to grado
Matemáticas mentales Worksheet
Name: ____________________Date: ____________
Instructions: Usar estrategias mentales como sumar diez, duplicar y compensar para calcular rápidamente.
20 problems
77 + 20 = ______
21 − 10 = ______
42 + 20 = ______
50 + 20 = ______
77 + 10 = ______
88 + 10 = ______
2 × 10 = ______
27 + 10 = ______
80 − 10 = ______
69 + 10 = ______
71 − 10 = ______
18 + 20 = ______
66 − 10 = ______
6 × 10 = ______
7 × 10 = ______
13 + 10 = ______
31 − 10 = ______
78 − 10 = ______
68 + 10 = ______
45 − 10 = ______
