Bài 1. Tính nhẩm \(9 \times 5 =\) \(63 : 7 =\) \(8 \times 8 =\) \(5 \times 7 =\) \(8 \times 7 =\) \(
Câu 1. Tính nhẩm
\(9 \times 5 =\) \(63 : 7 =\) \(8 \times 8 =\) \(5 \times 7 =\) \(8 \times 7 =\)
\(3 \times 8 =\) \(40 : 5 =\) \( 5 \times 5 =\)
\(7 \times 5 =\) \(7 \times 8 =\)
\(6 \times 4 =\) \(45 : 9 =\) \(7 \times 7 =\) \(35 : 5 =\) \(56 : 8 =\)
\(2 \times 8 =\) \(81 : 9 =\) \(9 \times 9 =\) \(35 : 7 =\) \(56 : 7 =\)
Giải
\(9 \times 5 =45\) \(63 : 7 =9\) \(8 \times 8 =64\) \(5 \times 7 =35\) \(8 \times 7 =56\)
\(3 \times 8 =24\) \(40 : 5 =8\) \( 5 \times 5 =25\) \(7 \times 5 =35\) \(7 \times 8 =56\)
\(6 \times 4 =24\) \(45 : 9 =5\) \(7 \times 7 =49\) \(35 : 5 =7\) \(56 : 8 =7\)
\(2 \times 8 =16\) \(81 : 9 =9\) \(9 \times 9 =81\) \(35 : 7 =5\) \(56 : 7 =8\)