1. 101
   216
2. 290
   412

12x18=216. Be honest - were you tempted to use a calculator for this one? Break it down into two parts - 10 times 18 and 2 times 18.

1. 25
   150
2. 250
   1,500

10x15=150. When multiplying a number by 10, you can just add a zero to it to find the right answer.

1. 154
   367
2. 400
   425

17x25=425. Whenever you multiply a number that ends in a 5, the result will end in either a 5 or a 0.

1. 201
   330
2. 500
   6,050

11x30=330. When you multiply a two-digit number ending in zero by 11, repeat the first digit and then add a zero on the end to find the answer.

1. 500
   1,092
2. 2,001
   5,550

21x52=1092. Did you use a calculator or break it down and do it in your head? It's just 20 times 52, plus one extra 52.

1. 408
   789
2. 800
   1,204

34x12=408. When two even numbers are multiplied, the answer is also even.

1. 450
   980
2. 1,045
   2,007

98x10=980. Here the rule of ten applies.

1. 1,769
   1,900
2. 4,569
   10,000

61x29=1,769. You could try multiplying 60x29, then adding one extra 29!

1. 502
   1,320
2. 1,550
   7,000

50x31=1,550. If it makes it easier, you can break problems like this down. Multiplying 31 by 5 and then multiplying that answer by 10 will get you to the same place.

1. 781
   1,560
2. 2,940
   5,000

42x70=2,940. Multiply 42 by 7, then add a zero at the end!

1. 400
   1,045
2. 2,089
   10,980

11x95=1,045. Think about it - you could just add 950 and 95.

1. 3,692
   4,500
2. 9,073
   10,001

52x71=3,692. Multiply 52 by 70, then add an extra 52.

1. 981
   1,236
2. 2,000
   2,465

85x29=2,465. Sometimes, when dealing with multiples of five, breaking things down can help. 5x17=85. So, multiplying 29 by 5, and then that answer by 17 will get you to the same place.

1. 2,006
   3,451
2. 5,011
   6,417

69x93=6,417. Did you break this down? Multiply 70 by 93, then subtract 93.

1. 908
   1,653
2. 2,569
   5,000

87x19=1,653. Try multiplying 87 by 20, then subtracting the extra 87!

1. 180
   2,340
2. 3,952
   7,851

52x76=3,952. How did you break this one down? Perhaps 50 times 76, added to 2 times 76?

1. 2,320
   3,678
2. 4,560
   7,800

80x29=2,320. When broken down, this one gets a little bit easier. 8x10=80, so you can also do 29x10, and then multiply that answer by 8 to get to the final answer.

1. 2,890
   3,000
2. 4,050
   5,666

90x45=4,050. Try 9 times 45, then multiplying that by 10. Simple, right?

1. 4,560
   5,445
2. 6,820
   7,771

55x99=5,445. 99 is almost 100, so multiply 55 by 100 and subtract 55.

1. 502
   1,001
2. 1,907
   3,336

13x77=1,001. Remember, when you multiply a pair of odd numbers, the answer will always be odd. How did you break this one down into manageable parts?

1. 100
   576
2. 1,890
   2,295

51x45=2,295. Multiply 45 by 50, then add an extra 45, right?

1. 1,748
   2,000
2. 2,689
   5,601

23x76=1,748. When an odd number and even number are multiplied. the answer is always an even number.

1. 308
   572
2. 789
   900

52x11=572. That's 520 plus 52. Does that make sense? Use the 11 to your best advantage.

1. 5,678
   6,970
2. 7,590
   9,327

85x82=6,970. 8x8 is 64, which can give you a rough instant idea of around what the final answer will start with. Remember your simple multiples!

1. 300
   2,500
2. 4,500
   9,500

90x50=4,500. When multiplying by two-digit numbers that end in 0, each adds a 0 to the final answer.

1. 456
   1,452
2. 4,000
   6,958

98x71=6,958. Don't panic - it's just 98 times 70, then an extra 98. That's 6,860 plus 98, which is 6,958.

1. 4,569
   6,636
2. 7,200
   7,981

84x79=6,636. Think about multiplying 84 by 80, then take things from there.

1. 91
   501
2. 792
   1,009

12x66=792. You can break this down into the multiples of 12 to make it a little easier. For example: 66x4x3=792.

1. 2,346
   4,500
2. 6,788
   7,744

88x88=7,744. Multiply 88 by 8, then multiply 88 by 80, then add the results. So many 8s!

1. 1,000
   2,652
2. 3,799
   6,780

51x52=2,652. You know 50 times 50 is 2,500, so your answer has to be a little bit more than that.

1. 1,794
   2,000
2. 3,493
   5,037

78x23=1,794. Remember, multiplying an odd and an even number always results in an even number.

1. 506
   1,045
2. 2,906
   3,596

62x58=3,596. Will you round down the 62 to make this one easier, or round up the 58?

1. 2,442
   3,001
2. 4,578
   4,990

66x37=2,442. Multiply 6 by 37, then 60 by 37. Now just add those together.

1. 450
   1,350
2. 2,002
   2,987

15x90=1,350. When multiplying multiples of 5, your answer can only end in 0 or 5.

1. 980
   5,209
2. 9,801
   18,009

99x99=9,801. You can break multiples of 9 down into 3s if it helps! Alternatively, multiply 100 by 99, then subtract 99.