1. What must be added to 391 to make 400? (391必须加上多少才等于400?)答案:400-391=9英语:400 minus 391 is 9 2. 368 plus(加)200 is(等于)(568) 315 minus(减)100 is (215) 照这样自己出几道 3. Can you spot the patterns of the followings?(你能找出下列规律吗) 2 4 6 (8) (10) 2 5 8 11 (14) 100 95 90 (85) (80) 26 21 16 (11) (6) 1 3 5 (7) (9) 1 4 9 16 (25)解释 1×1 2×2 3×3 4×4 5×5
例:inside a box is six small boxes,inside each small boxes is six smaller boxes,how many boxes are there altogether? 47 在一个盒子里有六个小盒子,在每个小盒子里有六个更小的盒子,总共有几个盒子?