三年级数学计算比赛训练题二54342(国外英文资料).docVIP

三年级数学计算比赛训练题二54342(国外英文资料) 31. time is like a sponge of water, as long as willing to squeeze, there are always - Lu Xun Calculation problem A, I 7247= 2715= 20 * 5= 63 / 3= 510 / 3= 27 * 5= 40 * 9= 23 * 30= 84 * 4= 99 / 4= 12 / 9= 75 / 5= 205 / 5= 46 * 10= 24 * 20= 872124= 27127= 700 83019 35070= 5= 178 / 2= 30 * 80= 800 / 8= 901 26585= / 3= 0 / 245= 0 * 245= 0245= 3000300= 245 / 5= 605 / 5= 50 * 50= 306 / 3= 480 / 3= 27 * 8= 702199= 860 / 4= 19 * 5= 40 * 20= 51 * 520430= 17= 87 / 3= 130 * 4= Two, calculated by the vertical, later to check No. 56 * 34= 85 * 79= 40 * 38= 89 * 64= 45 * 56= 78 * 30= 624 / 6= 482 / 4= 835 / 5= 702 / 5= 86 * 50= 365 * 8= * 206 * 4= * 480, 7= 835+696= Three. Estimate The product of 34 x 22 is approximately (); the product of 27 * 23 is approximately (); The product of 59 x 64 is approximately (); the product of 40 * 32 is approximately (); 712 / 6 of the business is about () (100, ten) -; 228 / 3 of the business is about () (100, ten) -; The product ratio of 37 * 65 is larger than (smaller); The product ratio of 76 * 32 is larger than (smaller); To make the 35 / 7 of the business is three digits, and middlemen is zero, can fill () Known 83019 = 73... 6..., when the hour (= =), () Four, formula riddle Five, observe the following formula, find the rules, and then fill out the brackets 99 x 1 = 1001 = 9999 x 8 = (-) () = () 99 x 2 = 2002 = 19899 x 9 = (-) () = () 99 x 3 = 3003 = 29799 x 12 = (-) () = () Application exercises The 128 children visited the planetarium. They were divided into 2 teams on average. Each team was divided into 4 groups on average. How many people were there in each group? 3 children each buy a pair of table tennis bat, altogether use 144 yuan, each table tennis racket how many yuan? There are 2 flower beds in the campus. Each flower garden has 4 rows of flowers. There are 96 flowers in each of them. How many trees are there in each garden? The students made 108 butterfly specimens. They were placed in 2 sample boxes