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) 4.86 + 8.19
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2) 9.91 + 1.05
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6) 6.75 + 4.96
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3) 12.53 + 2.93
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7) 345.46 + 1.28
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4) 43.15 + 1.34
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8) 234.85 + 0.75
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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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