ชื่อ – สกุล .................................................................................... ชั้น............. เลขที่ ...................
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ใบงาน เรื่อง การบวกทศนิยมไม่เกินสองตำแหน่ง
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คำชี้แจง ให้นักเรียนแสดงวิธีทำหาคำตอบ ต่อไปนี้
1) 23.43 + 0.16
วิธีทำ 2 3.4 3
0.1 6
2 3.5 9
ตอบ 23.43 + 0.16 = 23.59
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5) 884.86 + 899.11
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2) 10.96 + 56.25
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6) 786.75 + 994.96
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3) 342.53 + 266.03
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7) 345.46 + 1111.28
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4) 13.15 + 58.34
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8) 234.25 + 230.75
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ปริมาตรปริซึม ตัวอย่างการคำนวณปริมาตรปริซึม ปริซึมสี่เหลี่ยมรูปหนึ่ง กว้าง 4 เซ็นติเมตร ยาว 8 เซ็นติเมตร และสูง 15 เซ็นติเมตร จงหาปริมาตรปริซึมสี่เหลี่ยมรูปนี้ วิธีทำ จากสูตรการหาปริมาตรของปริซึม = พื้นที่ฐาน x สูง จากรูป ฐานของรูปปริซึมสี่เหลี่ยมรูปนี้เป็นรูปสี่เหลี่ยมผืนผ้า กว้าง 4 cm. และยาว 8 cm. ดังนั้น พื้นที่ฐานรูปสี่เหลี่ยมผืนผ้า = ก x ย แทนค่าตามสูตรปริมาตรปริซึม = พื้นที่ฐาน x สูง = ก x ย x ส ...
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