Counting in big steps

Mathematics · Number Representation & Place Value · ages 9-10

Name ______________________ Date ____________

Count back in 100,000s from 700,000. What is the next number?
Answer: ______________
Count on in 10,000s from 384,000. What is the next number?
Answer: ______________
Count on in 10,000s from 462,000. What comes next?
- 463,000
- 472,000
- 562,000
Counting on in 1,000s from 34,500 gives 35,500 as the next number.
Circle one: True False
Which sequence correctly counts on in 100,000s starting at 250,000?
- 250,000; 260,000; 270,000
- 250,000; 350,000; 450,000
- 250,000; 251,000; 252,000
What is the rule for 190,000, 290,000, 390,000?
- Add 10,000 each time
- Add 100,000 each time
- Add 1,000,000 each time
- Subtract 100,000 each time
Dan says 295,000, 305,000, 315,000 continues in 10,000s. Is Dan right?
Circle one: True False
What comes next in this pattern: 375,000; 475,000; 575,000; ...?
Answer: ______________
Mia counted back in 10,000s from 620,000: 620,000, 610,000, 600,000, 590,000, 480,000. Which term breaks the pattern?
- 600,000
- 590,000
- 480,000
Sana says 600,000, 500,000, 400,000, 300,000 counts back in 10,000s. Is Sana right?
Circle one: True False

Answer key

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

600000 · 700,000 - 100,000 = 600,000.
394000 · 384,000 + 10,000 = 394,000.
472,000 · Add 10,000: only the ten-thousands digit changes, from 6 to 7.
True · 34,500 plus 1,000 is 35,500. Only the thousands digit changed.
250,000; 350,000; 450,000 · Each step adds 100,000: 250,000, then 350,000, then 450,000. The other options add 10,000 or 1,000 instead.
Add 100,000 each time · Each term is 100,000 more than the one before.
True · Dan is right: each step adds exactly 10,000.
675000 · Each term adds 100,000, so the next term is 675,000.
480,000 · Each jump should be 10,000. After 590,000 the next term should be 580,000, not 480,000, which is a jump of 110,000.
False · Sana is wrong: the steps are 100,000s, not 10,000s.