計算:\(\frac{5}{7} - \frac{2}{7} + \frac{3}{7}\) 的結果是甚麼?
Primary School · Mathematics
Fractions (Mixed operations of addition and subtraction, Fractions with same denominators): Practice Questions
5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Fractions (Mixed operations of addition and subtraction, Fractions with same denominators).
一瓶果汁原本有 \( 1 \) 升。弟弟上午喝了 \( \frac{2}{9} \) 升,下午又喝了 \( \frac{4}{9} \) 升。請問這瓶果汁還剩下多少升?
一個油缸原本是空的。工人第一次注入了油缸容量的 $$\frac{15}{24}$$ 的油,第二次取出了油缸容量的 $$\frac{7}{24}$$ 的油,最後再注入了油缸容量的 $$\frac{10}{24}$$ 的油。如果油缸的最大容量是1,計算油缸中現有的油佔總容量的多少?並將答案化為最簡分數。
小明有一塊蛋糕。他吃了 \( \frac{2}{9} \) 塊,妹妹吃了 \( \frac{3}{9} \) 塊。之後,媽媽又給了他 \( \frac{1}{9} \) 塊。小明現在還有多少塊蛋糕?
小志今天喝了 \(\frac{4}{15}\) 升水,比昨天少喝了 \(\frac{2}{15}\) 升。他兩天共喝了多少升水?
小美有一條長 \(\frac{11}{12}\) 米的絲帶。她包裝禮物用去了 \(\frac{5}{12}\) 米,後來她又買了 \(\frac{3}{12}\) 米。絲帶現在長多少米?
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計算:\( 1 - \frac{7}{17} + \frac{3}{17} \)
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某修路工程,第一天修了全長的 \( \frac{3}{20} \),第二天修的比第一天多 \( \frac{2}{20} \),兩天後還剩下全長的幾分之幾未修?
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美玲在家中做勞作,上午用了 \(\frac{3}{10}\) 米絲帶,下午用了 \(\frac{4}{10}\) 米絲帶。
(a) 美玲全日共用了絲帶多少米?
(b) 如果原本美玲有一卷長 \(\frac{9}{10}\) 米的絲帶,完成勞作後還剩下多少米? (請以最簡分數作答)< /p>
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小志、家嘉和子軒三人合力製作模型,他們原有一袋重 \( 3\frac{7}{10} \) 公斤的石膏粉。
(a) 小志在上午用去了 \( 1\frac{2}{10} \) 公斤石膏粉,下午他發現不夠,又再用去了 \( \frac{4}{10} \) 公斤。小志全日共用去了多少公斤石膏粉?
(b) 家嘉隨後用去了 \( 1\frac{1}{10} \) 公斤。請問在小志和家嘉完成後,這袋石膏粉還剩下多少公斤?
(c) 子軒需要剩下的所有石膏粉,但他不小心在搬運時弄灑了 \( \frac{3}{10} \) 公斤。請問子軒最後實際可以用到多少公斤石膏粉?(答案須化為最簡分數)
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