Help students build strong number sense with these 10 more, 10 less, 100 more, and 100 less worksheets for Grade 2.
Try these online before or after you print the worksheet. Click an answer to check it, or open "Show answer" to see how it works. The coloured box shows which digit should move.
What is 10 more than 346?
356. Adding 10 moves the tens digit up by one: 4 tens become 5 tens. The hundreds and the ones do not change.
What is 100 more than 346?
446. Adding 100 moves the hundreds digit up by one: 3 hundreds become 4 hundreds. The tens and the ones stay exactly where they were.
What is 10 more than 395?
405. This is the tricky one. 9 tens plus 1 ten is 10 tens, and 10 tens make a whole new hundred. So the 3 becomes a 4 and the tens go back to 0.
What is 10 less than 302?
292. There are 0 tens to take from, so you trade one of the hundreds for 10 tens first. 3 hundreds 0 tens becomes 2 hundreds 10 tens, and taking one ten away leaves 9 tens.
What is 100 less than 150?
50. Taking 100 from 1 hundred leaves 0 hundreds, so the answer is a two-digit number. That is allowed - the 1 is simply gone.
What is 10 less than 507?
497. Trade the hundred again: 5 hundreds 0 tens is the same as 4 hundreds 10 tens. One ten away leaves 9 tens, so 497.
What is 100 more than 489?
589. Only the hundreds digit moves: 4 becomes 5. The 89 on the end is untouched.
What is 10 less than 260?
250. Six tens take away one ten is five tens. Nothing else moves.
No buttons on these ones. Have a go first, then check.
When you add 10 to a number, which digit usually changes?
The tens digit. The ones never change, and the hundreds only change if the tens were already at 9.
Rosa says "100 more than 462 is 562, so 100 more than 962 must be 1062." Is she right?
Yes. 9 hundreds plus 1 hundred is 10 hundreds, which is one thousand. The pattern keeps working, the number just gets a new column.
Why is it quicker to add 10 in your head than to count on 10 times?
Because you only have to change one digit. Counting on ten times gives the same answer but takes ten steps and is easy to lose track of.
Keep going: 604, 594, 584, ... What are the next two numbers, and what is the rule?
574 and 564. The rule is "10 less each time". Watch the jump from 604 to 594 - the hundreds digit moved because there were 0 tens to take from.
Want it on paper? Download the free printable worksheet above - three pages of practice plus a full answer key.