第 1 题
1 分What is the result of subtracting 8 from 20?
Key Stage 1 (KS1) · Mathematics
加法與減法：练习题
5 道选择题即时批改，另有 3 道文字题附完整解题步骤，全部围绕「加法與減法」。
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第 2 题
1 分A baker has 42 cupcakes. He sells 18 cupcakes in the morning and 15 cupcakes in the afternoon. How many cupcakes does he have left at the end of the day?
\( 42 - 18 - 15 = ? \)
第 3 题
1 分Sam has 64 marbles. He gives 28 marbles to Tom and then receives 15 marbles from Sarah. How many marbles does Sam have now?
第 4 题
1 分Calculate the sum:
\(15 + 4 = ?\)
第 5 题
1 分Mary had 50 stickers. She gave some to her brother and has 32 stickers left. How many stickers did she give away?
第 6 题
2 分Calculate the sum of \( 14 \) and \( 23 \).
先自己写一遍答案，再对照解题步骤。
第 7 题
2 分Find the difference between \( 58 \) and \( 16 \).
先自己写一遍答案，再对照解题步骤。
第 8 题
4 分Tom has 12 red marbles and 15 blue marbles in a bag.
(a) How many marbles does he have in total?
(b) If he gives 7 marbles to his sister, how many marbles does he have left?
先自己写一遍答案，再对照解题步骤。
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