Lesson 8 of 8 · Grade 1 and 2
Numbers on a 100 chart
On a 100 chart, down one row is ten more. Up one row is ten less.
Step 1
Learn it
Rows of ten
Each row has 10 numbers. The first row is 1 to 10. The second row is 11 to 20.
Right and left
Move right: one more. Move left: one less.
Down and up
Move down one row: ten more. Move up one row: ten less.
Step 2
Watch how
Two examples, worked out one step at a time.
Start at 23. Go down one row.
Down one row is 10 more. 23 + 10 = 33.
Answer: 33Start at 67. Go up one row.
Up one row is 10 less. 67 − 10 = 57.
Answer: 57
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.
Start at 15. Go down one row.
Show answer
25
Start at 48. Go up two rows.
Show answer
28
Start at 34. Go down one row, then right one.
Show answer
45
What number is just below 59?
Show answer
69
What number is just above 90?
Show answer
80