12 - 7 = 5 14 - 5 = 9 4 + 9 = 13 9 + 8 = 17

15 - 5 = 10 18 - 9 = 9 59 - 9 = 50 50 + 8 =58

10 + 40 = 50 45 - 5 = 40 36 + 5 = 4 1 75 - 30 =45

57 - 40 = 17 18 + 9 = 27 27 + 5 = 32 73 - 40 = 33

35 + 4 + 9 = 48 54 + 30 + 4 =88

24 + 30 + 5 = 59 86 - 6 - 50 =30

Two. Fill in the blanks (33 points) ★

1 and 67 have (6) tens and (7) ones; The number consisting of eight ones and four tens is (48).

2, a number of places, (100) one is100; Ten places, (10) Ten is 100.

One tenth of 3 and 34 is (3), which means (3) tens; Its unit is (4), which means (4) one.

4. From the right, the first place is (1), the second place is ten, and the third place is (100).

The number before 5 and 74 is (73), and the number after 5 is (75).

6. The following table: 77 is on the (upper) surface of 88; 77 is on the (lower) surface of 66; To the left of 66 is (), and below 88 is (77).

15

70

66

50

22

25

88

77

nine

96

100

35

Forty two.

18

3 1

7. Line up these numbers in descending order: 76, 25, 60, 19, 100, 82, 46.

( 100)>(82)>(76)>(60)>(46)>(25)>( 19 )

8. 18 continuously subtracts 3: 18, _ 15__, __ 12__, 9 _ _, 6 _ _.

9,9 adds 7: 9 continuously, __ 16__, __23__, __30__, 37 _ _.