Qingdao Edition Primary School Mathematics Grade Five Volume I Unit 1 Exam 20 12.9 Class 1. Fill in the blanks. The decimal point of 1 7.45 Move one place to the right. Will this figure be expanded to the original? Time magazine. 2.5.9807 Keeping one decimal place means keeping two decimal places, accurate to one thousandth. 3. A non-zero number is multiplied by a time product less than 1 and then multiplied by a time product greater than 1. 4. Three-digit decimal? Two decimal places are 1.80? What is the maximum value of this three-digit decimal? At the very least. 5.0.98×99=0.98× ? What is the approximate value of the product of -0.98× () 6.0.4× 90.8 with two decimal places? The approximate value of a decimal place is the product of 7. 0. 13×7. Decimal? Is there a product of 0.84×5 after simplification? Decimal number. 8. Fill in ○ >, & LTOR = 32.6× 0.99 ○ 32.68.56× 8.56×1.1.003.9956.2×1.2× 56.2× 0.999 9. According to 48 × 32 = 4.8×32=? 0.48×3.2=? ? 480×? ? = 15.36 4.8×? ? =0. 1536 10. What is the product of the largest single digit and the smallest two digits with the integer part of 0? . 2. True or false 1. 1.25×? 0.8+ 1? = 1.25×0.8+ 1。 ? ? ? ? 2. The product of two decimal places must be less than 1. ? ? ? ? The product of 3.0.02 and 0.03 is 0.06. ? ? ? ? 4. 2.05 times of a number must be greater than the original number. ? ? ? ? 5. Multiply by two factors? A factor amplification 100 times? Another factor decreased by one percent? The product remains unchanged. ? ? Three? Multiple choice questions? 1. A number? Except 0? Multiply their product by a number greater than 1 This number. A greater than b less than c equals 2. 2.3×□+7.7×□=4.06? □ Should be filled in? ? A.4.06b.40.6c.0.0406d.0.406 3.0.38× 0.25 decimal A.1b.2c.3d.44. A number? Except 0? Multiply by 0.0 1? Product of income? ? Original number. A. greater than B. equals C. less than D. None of the above is correct. 5. What is the decimal of two digits? What's the smallest number? ? A.7.99 B.8. 1 C.7.94 D.7.95 IV? Calculation? 1. What is the number written directly? 0.8× 25 = 0× 4.23 = 0.57+0.43 = 0.02× 500 =12.5× 8 = 50× 0.04 = 80× 0.3 =1.1× 9 = 2. 14.8×38.2 = 48×0.352= 35.6×5.06? Keep the number to one decimal place? 6.728×3.2= ? Numbers are kept to two decimal places. 3. Offline computing? What can be simplified should be simplified. 4.2× 7.8+2.2× 4.29.5×101(8× 3.82 )×1.250.125× 725? Column calculation. ? The product of 1 4 and 2.25? Multiplied by 3.6? What was the result? 2. What is the number that is 3.05 times smaller than 65438+0.5 times of 4.7? 3. What is 3.28, which is 2.5 times more than 4.8? Six? Solve the problem 1. The students learn to cook in the labor class. ? About 0.006 grams of salt is needed per 1 kg of vegetables. How many grams of salt does it take to fry 500 grams of vegetables now? 2.A car and B car leave from two places at the same time? See you in six hours. ? A car is 90 kilometers per hour? The speed of car B is 1.08 times that of car A? How many kilometers are there between these two places? 3. Party A and Party B jointly produce a batch of parts. Party A produces 30 parts per hour and Party B produces 36 parts per hour. Five hours later, all these parts were produced. ? How many parts are there in this batch? Several workers planted 32 trees on one side of Three Gorges Reservoir. Each tree is 3.64 meters apart. How many meters is it from the first tree to the last tree? The area of the school library is 85 square meters. The ground is paved with a square brick with a side length of 0.9 meters. 100 is enough? 6. A train is 300 meters long. It takes 52.5 seconds for the train to cross the bridge at a speed of 20 meters per second. How long is this bridge? Smart house? A barrel of oil weighs 6 kilograms, and it weighs 3.05 kilograms after half of it is used. How much does this barrel of oil weigh?