摘要
I.Fill in the blanks.1.Five 1s and nine 1s make_____.2.14 ones and 7 ones make_____.3.52 plus 9 is_____.4.45 adds 5.The answer is_____.5.19 ones and_____ones make 70.6._____subtracts 16.The answer is 38.7.58 minus 19 is equal to_____.8.60 minus_____equals 24.9.3 tens and 6 tens make_____tens.10._____tens and 2 tens make 90.11.21 more than_____is 78.12._____more than 36 is 100.13.42 less than_____is 17.14.65 less than 90 is_____.
