小學三年級數(shù)學口算：整十數(shù)乘兩位數(shù)

（1）40 × 40 =
    （2）82 × 90 =
    （3）92 × 60 =
    （4）18 × 80 =
    （5）30 × 81 =
    （6）96 × 80 =
    （7）50 × 86 =
    （8）13 × 10 =
    （9）10 × 20 =
    （10）30 × 26 =
    （11）30 × 62 =
    （12）88 × 40 =
    （13）88 × 30 =
    （14）60 × 45 =
    （15）70 × 65 =