乘与除
Multiplying and dividing
将整数和小数乘以或除以10、100和1000
Multiply and divide whole numbers and those involving decimals by 10, 100, and 1000
学习证据 / Evidence
- 计算 3.45 × 100 = 345
- 计算 72 ÷ 1000 = 0.072
- 解释乘以10时每一位数字向左移动一位
- Calculate 3.45 × 100 = 345
- Calculate 72 ÷ 1000 = 0.072
- Explain that multiplying by 10 shifts each digit one place to the left
评估问题 / Assessment
{{name}}能快速算出“4.7 × 100”或“3,600 ÷ 1,000”吗——并且知道乘以或除以时，数字在数位表中会向左或向右移动？
Can {{name}} quickly work out '4.7 × 100' or '3,600 ÷ 1,000' — knowing that digits shift left or right in the place-value chart depending on whether they're multiplying or dividing?