Page 20 - PlayFacto_P7
P. 20
Ordering numbers to 50
The numbers increase by 1 to the right and decrease by 1 to the left.
Increase by 1.
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
Decrease by 1.
Example 1 Fill in the blanks. twenty-four
⑴
twenty-three
⑵ thirty-two
thirty-one
⑶ forty-six forty-seven
forty-five
⑷
16 17 18
2. Ordering numbers 17
The numbers increase by 1 to the right and decrease by 1 to the left.
Increase by 1.
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
Decrease by 1.
Example 1 Fill in the blanks. twenty-four
⑴
twenty-three
⑵ thirty-two
thirty-one
⑶ forty-six forty-seven
forty-five
⑷
16 17 18
2. Ordering numbers 17
