ชื่อ – สกุล .................................................................................... ชั้น............. เลขที่ ...................
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ใบงาน เรื่อง การคูณทศนิยมหนึ่งตำแหน่งด้วยทศนิยมหนึ่งตำแหน่ง
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คำชี้แจง ให้นักเรียนแสดงวิธีทำหาคำตอบ ต่อไปนี้
1) 234.3 × 1.6
×
วิธีทำ 2 3 4 3
1 6
1 4 0 5 8
+
2 3 4 3
3 7 4 8 8
ตอบ 234.3 × 1.6 = 374.88
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5) 4.6 × 8.9
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2) 9.9 × 1.5
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6) 6.7 × 4.9
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3) 125.3 × 2.9
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7) 3454.6 × 1.2
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4) 431.5 × 1.9
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8) 2348.5 × 0.9
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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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