... hone their mental math skills 锻炼心算 work out complex sums 计算复杂的算术题 test arithmetic ability 测试算术能力 ...
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work out complex sums
求复数和
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"All young children should be confident with methods of addition, subtraction, times tables and division before they pick up the calculator to work out more complex sums, " she said.
BBC: Government bans calculators from primary maths tests
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