Question 4Identify the pattern and fill the blank: 1×9+2=11; 12×9+3=111; 123×9+4=1111; …; 1234567×9+8=( ).
Question 6The number pattern is 240, 120, Y, 30, 15, … . Find the sum of the first and third numbers.
Question 8Twelve children stand in a line with 6 m between adjacent children. How long is the line from first to last?
Question 9Two boards nailed together measure 160 cm, with 45 cm of overlap. One board is 85 cm long. How long is the other?
Question 10Jia Xin finishes a book in three days: 27 pages on day one and 54 pages over the remaining two days. What is her daily average?
Question 12A number is increased by 5, multiplied by 6, then decreased by 9; the result is 27. What is the original number?
Question 13There are 220 chickens and ducks altogether. The number of chickens is 20 less than three times the number of ducks. How many of each?
Question 15Two Year 3 classes: after seven students move from the first to the second, the first class has three fewer students. How many more did the first class have originally?
Question 16Mei Mei is nine and her mother is 37 this year. After how many years will the mother be three times Mei Mei's age?
Question 19A rectangle has perimeter 42 cm and its length is twice its width. What are the length and width?
Question 20Of 36 exam students, 21 got Question 1 right and 18 got Question 2 right. Everyone got at least one right. How many got both right?