加减乘除英语讲解.ppt

• What’s three plus four? It’s seven.
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subtraction
• 10－6＝?
• How much is ten minus six?
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10－6＝4
• Ten minus six is four.
• We also can use “take…from…”:
• ¾ three fourths; three quarters • ½ a half • ¼ a/one quarter • 1½ one and a half • 3¼ three and one fourth;
three and one quarter
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Some examples:
• How much is fifteen divided by five?
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15÷5＝3
• Fifteen divided by five is three. • Fifteen divided by five equals/makes
four.
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Some fractions
• Take six from ten,and the remainder is four. • (remainder n. 余下的部分)
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multiplication • Time (v.) or multiply
• 3×4＝? • How much is three times
four?
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3×4＝12
• Three times four is twelve. • Multiply three by four, we get twelve. • Three multiplied by four makes twelve.
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division
• 15÷5＝?
• 一个半小时： one and a half hours
• 二又四分之三米： two and three-fourths meters
• 五分之四英寸： four-fifths inch
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Thank you!
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• Three plus four is seven. • Three and four make seven.
• equal v./adj.
• So, we can say: • Three and four is equal to seven. • Three added to four equals seven.
加、减、乘、除
＋－×÷
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The Expressions
＋ add plus and － subtract minus × multiply ÷ divide
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Βιβλιοθήκη Baidu
addition
• 3+4=？
• How much is three plus four?
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3+4=7