Lesson 7 of 8 · Grade 1 and 2
Take away a ten
To take away a ten, the tens digit goes down by one. The ones stay the same.
Step 1
Learn it
-
Start with 58
5 tens and 8 ones.
-
Take away one rod
One less ten. Now 4 tens and 8 ones.
-
Only the tens change
58 − 10 = 48. The ones digit stays 8.
Step 2
Watch how
Two examples, worked out one step at a time.
-
58 − 10 = ?
5 tens − 1 ten = 4 tens. 8 ones stay. 48.
Answer: 48 -
73 − 10 = ?
7 tens − 1 ten = 6 tens. 3 ones stay. 63.
Answer: 63
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.
-
40 − 10 = ?
Show answer
30
-
29 − 10 = ?
Show answer
19
-
65 − 10 = ?
Show answer
55
-
81 − 10 = ?
Show answer
71
-
100 − 10 = ?
Show answer
90