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
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Rows of ten
Each row has 10 numbers. The first row is 1 to 10. The second row is 11 to 20.
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Right and left
Move right: one more. Move left: one less.
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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.
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Start at 23. Go down one row.
Down one row is 10 more. 23 + 10 = 33.
Answer: 33 -
Start 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.
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Start at 15. Go down one row.
Show answer
25
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Start at 48. Go up two rows.
Show answer
28
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Start at 34. Go down one row, then right one.
Show answer
45
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What number is just below 59?
Show answer
69
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What number is just above 90?
Show answer
80