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Home / Practice / Maths
The written method for multiplying by a two-digit number, including the zero everyone forgets.
Question 1 of 12
Work out 741 × 68.
Split 68 into 60 and 8, and multiply 741 by each part. 741 × 8 = 5,928. 741 × 60 = 44,460 — note the zero on the end, because this row is 741 × 6 tens, not 741 × 6. Adding the two rows: 5,928 + 44,460 = 50,388. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
The answer is B. Split 68 into 60 and 8, and multiply 741 by each part. 741 × 8 = 5,928. 741 × 60 = 44,460 — note the zero on the end, because this row is 741 × 6 tens, not 741 × 6. Adding the two rows: 5,928 + 44,460 = 50,388. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
Work out 254 × 43.
Split 43 into 40 and 3, and multiply 254 by each part. 254 × 3 = 762. 254 × 40 = 10,160 — note the zero on the end, because this row is 254 × 4 tens, not 254 × 4. Adding the two rows: 762 + 10,160 = 10,922. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
The answer is B. Split 43 into 40 and 3, and multiply 254 by each part. 254 × 3 = 762. 254 × 40 = 10,160 — note the zero on the end, because this row is 254 × 4 tens, not 254 × 4. Adding the two rows: 762 + 10,160 = 10,922. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
Work out 244 × 62.
Split 62 into 60 and 2, and multiply 244 by each part. 244 × 2 = 488. 244 × 60 = 14,640 — note the zero on the end, because this row is 244 × 6 tens, not 244 × 6. Adding the two rows: 488 + 14,640 = 15,128. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
The answer is C. Split 62 into 60 and 2, and multiply 244 by each part. 244 × 2 = 488. 244 × 60 = 14,640 — note the zero on the end, because this row is 244 × 6 tens, not 244 × 6. Adding the two rows: 488 + 14,640 = 15,128. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
Work out 147 × 66.
Split 66 into 60 and 6, and multiply 147 by each part. 147 × 6 = 882. 147 × 60 = 8,820 — note the zero on the end, because this row is 147 × 6 tens, not 147 × 6. Adding the two rows: 882 + 8,820 = 9,702. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
The answer is A. Split 66 into 60 and 6, and multiply 147 by each part. 147 × 6 = 882. 147 × 60 = 8,820 — note the zero on the end, because this row is 147 × 6 tens, not 147 × 6. Adding the two rows: 882 + 8,820 = 9,702. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
Work out 785 × 52.
Split 52 into 50 and 2, and multiply 785 by each part. 785 × 2 = 1,570. 785 × 50 = 39,250 — note the zero on the end, because this row is 785 × 5 tens, not 785 × 5. Adding the two rows: 1,570 + 39,250 = 40,820. Estimate first. Here, roughly 800 × 50 tells you what size of answer to expect.
The answer is B. Split 52 into 50 and 2, and multiply 785 by each part. 785 × 2 = 1,570. 785 × 50 = 39,250 — note the zero on the end, because this row is 785 × 5 tens, not 785 × 5. Adding the two rows: 1,570 + 39,250 = 40,820. Estimate first. Here, roughly 800 × 50 tells you what size of answer to expect.
Work out 409 × 24.
Split 24 into 20 and 4, and multiply 409 by each part. 409 × 4 = 1,636. 409 × 20 = 8,180 — note the zero on the end, because this row is 409 × 2 tens, not 409 × 2. Adding the two rows: 1,636 + 8,180 = 9,816. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
The answer is A. Split 24 into 20 and 4, and multiply 409 by each part. 409 × 4 = 1,636. 409 × 20 = 8,180 — note the zero on the end, because this row is 409 × 2 tens, not 409 × 2. Adding the two rows: 1,636 + 8,180 = 9,816. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
Work out 256 × 72.
Split 72 into 70 and 2, and multiply 256 by each part. 256 × 2 = 512. 256 × 70 = 17,920 — note the zero on the end, because this row is 256 × 7 tens, not 256 × 7. Adding the two rows: 512 + 17,920 = 18,432. Estimate first. Here, roughly 300 × 70 tells you what size of answer to expect.
The answer is B. Split 72 into 70 and 2, and multiply 256 by each part. 256 × 2 = 512. 256 × 70 = 17,920 — note the zero on the end, because this row is 256 × 7 tens, not 256 × 7. Adding the two rows: 512 + 17,920 = 18,432. Estimate first. Here, roughly 300 × 70 tells you what size of answer to expect.
Work out 839 × 64.
Split 64 into 60 and 4, and multiply 839 by each part. 839 × 4 = 3,356. 839 × 60 = 50,340 — note the zero on the end, because this row is 839 × 6 tens, not 839 × 6. Adding the two rows: 3,356 + 50,340 = 53,696. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
The answer is B. Split 64 into 60 and 4, and multiply 839 by each part. 839 × 4 = 3,356. 839 × 60 = 50,340 — note the zero on the end, because this row is 839 × 6 tens, not 839 × 6. Adding the two rows: 3,356 + 50,340 = 53,696. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
Work out 302 × 57.
Split 57 into 50 and 7, and multiply 302 by each part. 302 × 7 = 2,114. 302 × 50 = 15,100 — note the zero on the end, because this row is 302 × 5 tens, not 302 × 5. Adding the two rows: 2,114 + 15,100 = 17,214. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
The answer is D. Split 57 into 50 and 7, and multiply 302 by each part. 302 × 7 = 2,114. 302 × 50 = 15,100 — note the zero on the end, because this row is 302 × 5 tens, not 302 × 5. Adding the two rows: 2,114 + 15,100 = 17,214. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
Work out 610 × 39.
Split 39 into 30 and 9, and multiply 610 by each part. 610 × 9 = 5,490. 610 × 30 = 18,300 — note the zero on the end, because this row is 610 × 3 tens, not 610 × 3. Adding the two rows: 5,490 + 18,300 = 23,790. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
The answer is C. Split 39 into 30 and 9, and multiply 610 by each part. 610 × 9 = 5,490. 610 × 30 = 18,300 — note the zero on the end, because this row is 610 × 3 tens, not 610 × 3. Adding the two rows: 5,490 + 18,300 = 23,790. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
Work out 659 × 21.
Split 21 into 20 and 1, and multiply 659 by each part. 659 × 1 = 659. 659 × 20 = 13,180 — note the zero on the end, because this row is 659 × 2 tens, not 659 × 2. Adding the two rows: 659 + 13,180 = 13,839. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
The answer is A. Split 21 into 20 and 1, and multiply 659 by each part. 659 × 1 = 659. 659 × 20 = 13,180 — note the zero on the end, because this row is 659 × 2 tens, not 659 × 2. Adding the two rows: 659 + 13,180 = 13,839. The dropped zero on the second row is the single commonest error in long multiplication. Write it before anything else.
Work out 350 × 36.
Split 36 into 30 and 6, and multiply 350 by each part. 350 × 6 = 2,100. 350 × 30 = 10,500 — note the zero on the end, because this row is 350 × 3 tens, not 350 × 3. Adding the two rows: 2,100 + 10,500 = 12,600. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
The answer is A. Split 36 into 30 and 6, and multiply 350 by each part. 350 × 6 = 2,100. 350 × 30 = 10,500 — note the zero on the end, because this row is 350 × 3 tens, not 350 × 3. Adding the two rows: 2,100 + 10,500 = 12,600. Keep the columns straight. Most wrong answers in long multiplication are neat arithmetic added up crooked.
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