邹颖
I. Calculation.
(1) 3 + 9 =
(2) 8 + 4 =
(3) 12 + 5 =
(4) 13 + 6 =
(5) 11 + 9 =
(6) 8 + 4 =
(7) 10 – 7 =
(8) 20 – 18 =
(9) 15 – 12 =
(10) 13 – 8 =
(11) 12 – 6 =
(12) 17 – 9 =
II. Fill in the blanks.
(1) 10 + _____ = 16
(2) 14 – _____ = 7
(3) 13 + _____ = 18
(4) 19 – _____ = 9
(5) 6 + _____ = 15
(6) 20 – _____ = 4
III. Word problems.
(1)John has 12 marbles, and he gave 3 of them to his friend. How many marbles does John have left?
(2)Lisa had 18 stickers, and she bought 7 more at the store. How many stickers does Lisa have now?
(3)There are 16 students in the classroom. If 5 students are absent today, how many students are present?
(4)There are 8 apples in one basket and 11 apples in another. How many apples are there in these two baskets in total?
Keys to Self-assessment of Maths (1A)
I. (1) 12 (2) 12 (3) 17 (4) 19 (5) 20 (6) 12 (7) 3 (8) 2 (9) 3 (10) 5 (11) 6
(12) 8
II. (1) 6 (2) 7 (3) 5 (4) 10 (5) 9 (6) 16
III. (1) 9 (2) 25 (3) 11 (4) 19