به انگلیسی

Multiplying and dividing by 10, 100, and 1000

Mathematics · Multiplication & Division · ages 9-10

Name ______________________ Date ____________

Calculate 72 / 1000.
Answer: ______________
Calculate 3.45 x 100.
Answer: ______________
When you multiply a whole number by 100, which way do the digits shift, and by how many places?
- One place to the left
- Two places to the left
- Two places to the right
72 ÷ 1000 = 0.072.
Circle one: True False
If you divide a number by 1000, which way do the digits shift, and by how many places?
- Two places to the right
- Three places to the left
- Three places to the right
Calculate 450 / 10.
Answer: ______________
What is 6.7 x 100?
- 670
- 67
- 607
- 6700
Calculate 6.2 × 1000.
Answer: ______________
Jamal says 4.7 × 100 = 4.700, just adding zeros at the end. Is his answer correct?
- No, the digits shift two places left, so the answer is 470
- No, the answer should be 0.047
- Yes, that is correct
Ava says 3.45 x 100 = 34.5. Is Ava right?
Circle one: True False

Answer key

For grown-ups. Fold this page away before handing over the rest.

0.072 · 72 / 1000 = 0.072.
345 · 3.45 x 100 = 345.
Two places to the left · 100 has two zeros, so every digit moves two places to the left in the place-value chart.
True · 1000 has three zeros, so digits shift three places right, making 72 into 0.072.
Three places to the right · Dividing always shifts digits to the right, and 1000 has three zeros, so it is three places.
45 · 450 / 10 = 45.
670 · 6.7 x 100 = 670.
6200 · 1000 has three zeros, so every digit shifts three places left: 6.2 becomes 6200.
No, the digits shift two places left, so the answer is 470 · Adding zeros does not move any digit. Shifting each digit two places left gives 470, not 4.700.
False · Ava is wrong: 34.5 is 3.45 x 10. Times 100 gives 345.