Week 6 of 8
Week 6
1st Grade → 2nd Grade · Addition regrouping 20 and Reading comprehension
Math
Addition With Regrouping to 20
Adding within 20 when the ones cross a ten — 8 + 5, 7 + 6. Middle of first grade.
The mistake to watch for. Counting on from the smaller number (5 + 8 counted as five, then eight steps), which is slow and error-prone.
How to help. Teach make-a-ten: for 8 + 5, take 2 from the 5 to fill the 8 up to 10, then add the remaining 3. Ten plus three is instant.
A worked example
Try 8 + 5. Make a ten first: 8 needs 2 more to reach 10, so take 2 from the 5. Now you have 10 + 3 = 13.
Words for this week
- regroup
- To trade 10 ones for 1 ten (or 1 ten for 10 ones) when you add or subtract.
- ten
- The number 10, one more than nine.
- add
- To put numbers together to find how many in all.
- sum
- The answer you get when you add.
- total
- All of the things added together.
Read this week
Bryophyte
A short plants article from our Learn library, chosen for this reading level. Read it together, then ask your child to tell you one new thing they learned.