Nội dung bài giảng
1.Tính :
\(\matrix{ + \cr {} \cr } \matrix{ {432} \cr {\underline {356} } \cr {.....} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {524} \cr {\underline {173} } \cr {.....} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {618} \cr {\underline {321} } \cr {.....} \cr } \)
\(\matrix{ + \cr {} \cr } \matrix{ {261} \cr {\underline {715} } \cr {.....} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {452} \cr {\underline {526} } \cr {.....} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {265} \cr {\underline {413} } \cr {.....} \cr } \)
\(\matrix{ + \cr {} \cr } \matrix{ {436} \cr {\underline {153} } \cr {.....} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {622} \cr {\underline {350} } \cr {.....} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {630} \cr {\underline {155} } \cr {.....} \cr } \)
\(\matrix{ + \cr {} \cr } \matrix{ {153} \cr {\underline {{\rm{ }}26} } \cr {.....} \cr } \)
2.Đặt tính rồi tính
\(724 + 215\) \(806 + 172\) \(263 + 720\) \(624 + 55\)
………… ………… ………… ………...
………… ………… ………… …………
………… ………… ………… ………...
3.Tính nhẩm (theo mẫu)
a)400 + 300 = 700 800 + 100 = ….. 600 + 200 = …..
500 + 200 = ….. 300 + 300 = ….. 100 + 500 = …..
600300 = ….. 400 + 400 = ….. 200 + 200 = …..
b)700 + 300 = 1000 600 + 400 = ….. 800 + 200 = …..
900 + 100 = ….... 500 + 500 = ….. 400 + 600 = …..
GIẢI
1.Tính :
\(\matrix{ + \cr {} \cr } \matrix{ {432} \cr {\underline {356} } \cr {788} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {524} \cr {\underline {173} } \cr {697} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {618} \cr {\underline {321} } \cr {939} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {261} \cr {\underline {715} } \cr {976} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {452} \cr {\underline {526} } \cr {978} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {265} \cr {\underline {413} } \cr {678} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {436} \cr {\underline {153} } \cr {589} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {622} \cr {\underline {350} } \cr {972} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {630} \cr {\underline {155} } \cr {785} \cr }\) \(\matrix{ + \cr {} \cr } \matrix{ {153} \cr {\underline {{\rm{ }}26} } \cr {179} \cr } \)
2.Đặt tính rồi tính
\(724 + 215\) \(806 + 172\) \(263 + 720\)
\(\matrix{ + \cr {} \cr } \matrix{ {724} \cr {\underline {215} } \cr {939} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {806} \cr {\underline {172} } \cr {978} \cr } \) \(\matrix{ + \cr {} \cr } \matrix{ {263} \cr {\underline {720} } \cr {983} \cr } \) \(624 + 55\)
\(\matrix{ + \cr {} \cr } \matrix{ {624} \cr {\underline {{\rm{ }}55} } \cr {679} \cr } \)
3.Tính nhẩm (theo mẫu)
a)400 + 300 = 700 800 + 100 = 900 600 + 200 = 800
500 + 200 = 700 300 + 300 = 600 100 + 500 = 600
600 + 300 = 900 400 + 400 = 800 200 + 200 = 400
b)700 + 300 = 1000 600 + 400 = 1000 800 + 200 = 1000
900 + 100 = 1000 500 + 500 = 1000 400 + 600 = 1000