Lesson 6 of 8 · Grade 1 and 2
Add a ten
To add a ten, the tens digit goes up by one. The ones stay the same.
Step 1
Learn it
Start with 34
3 tens and 4 ones.
Add one rod
One more ten. Now 4 tens and 4 ones.
Only the tens change
34 + 10 = 44. The ones digit stays 4.
Step 2
Watch how
Two examples, worked out one step at a time.
34 + 10 = ?
3 tens + 1 ten = 4 tens. The 4 ones stay. 44.
Answer: 4452 + 10 = ?
5 tens + 1 ten = 6 tens. 2 ones stay. 62.
Answer: 62
Step 3
Play with it
Count by 2, 5 or 10 and light up the 100 chart.
Step 4
Practice
Five questions. Think first. Then tap Show answer.
20 + 10 = ?
Show answer
30
45 + 10 = ?
Show answer
55
63 + 10 = ?
Show answer
73
86 + 10 = ?
Show answer
96
90 + 10 = ?
Show answer
100