Tính nhẩm:
a) 30000 + (20000 + 40000) = .....
30000 + 20000 + 40000 = .....
60000 – (30000 + 20000) = .....
60000 – 30000 – 20000 = .....
b) 40000 ⨯ 2 : 4 = .....
36000 : 6 ⨯ 3 = .....
20000 ⨯ 4 : 8 = .....
60000 : 3 : 2 = .....
a) 30000 + (20000 + 40000) = 90000
30000 + 20000 + 40000 = 90000
60000 – (30000 + 20000) = 10000
60000 – 30000 – 20000 = 10000
b) 40000 ⨯ 2 : 4 = 20000
36000 : 6 ⨯ 3 = 18000
20000 ⨯ 4 : 8 = 10000
60000 : 3 : 2 = 10000
-- Mod Toán lớp 3
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