Year 1 Length and Height: check-up and quiz

Key words. Longer means it reaches further. Shorter means it stops sooner. Taller means it is higher.

Method. Line them up at the same start. Then see which one is longer.

1. Line them up at the same start. Start both at the same place, so the comparison is fair.
   A and B start together
2. Count the units to check. Count each one, one unit at a time.
   A: 8 cubes, B: 3 cubes
3. Compare the two. Look at the far ends. The one that goes further is longer, and the one that stops sooner is shorter.
   8 > 3
4. Write the answer.
   A is longer.

Check. Look at the picture again. A and B start together, and A is the longer one. ✓

Watch out. Do not judge only by where a thing is on the page. Line them up first.

Key words. Longest and tallest mean the biggest. Shortest means the smallest.

Method. Measure each one. The tallest one has the biggest number.

1. Measure each one. Count or read the length of each one.
   A: 3 cubes
   B: 6 cubes
   C: 4 cubes
2. Find the biggest number. Compare the numbers, not the names.
   6 is the biggest number
3. Write the answer.
   B is the tallest one.

Check. The other ones have less than 6. ✓

Watch out. Look at every one before you choose. The first one you see is not always the answer.

Key words. A unit is the thing we measure with, like a cube or a paper clip.

Method. Line the units up end to end, then count them one at a time.

1. Look at the row of units. The row is the length we measure.
   A row of 5 cubes
2. Count them one at a time. Touch each unit once as you say its number.
   1, 2, 3, 4, 5
3. Write the answer. The last number you say is how long the row is.
   5 cubes

Check. Count again from the other end. You get 5 again. ✓

Watch out. Do not miss a unit at the end, and do not count one twice.

Key words. A unit is the thing we measure with, like a cube or a paper clip.

Method. Line the units up end to end, then count them one at a time.

1. Look at the row of units. The row is the length we measure.
   A row of 7 paper clips
2. Count them one at a time. Touch each unit once as you say its number.
   1, 2, 3, 4, 5, 6, 7
3. Write the answer. The last number you say is how long the row is.
   7 paper clips

Check. Count again from the other end. You get 7 again. ✓

Watch out. Do not miss a unit at the end, and do not count one twice.

Key words. How much longer means the extra amount that one has.

Method. Line them up at the start. Count the extra part on the longer one.

1. Measure A. Count or read its length.
   A: 9 cubes
2. Measure B. Count or read its length.
   B: 6 cubes
3. Find the extra part. Take the smaller number away from the bigger number.
   9 − 6 = 3
4. Write the answer.
   3 cubes

Check. Check: 6 + 3 = 9. ✓

Watch out. Count only the extra part at the end of the longer one, not the whole of it.

Method. Double means two equal lots of the same number.

1. Start with 3. This is the length we want to double.
   3
2. Add 3 again. Two equal lots make double.
   3 + 3 = 6
3. Write the answer.
   6

Check. Half of 6 is 3, so double 3 must be 6. ✓

Watch out. Double means add the same number again. It is not add one more.

Method. Half means share it into two equal parts.

1. Start with 4. This is the whole strip.
   4
2. Share it into two equal parts. Each part must be exactly the same length.
   4 ÷ 2 = 2
3. Write the answer.
   2 cubes

Check. Put the two halves back together: 2 + 2 = 4. ✓

Watch out. The two parts must be equal. Count each part to check.

Method. Find the start and the end on the ruler. Then take the start away from the end.

1. Find where the line starts. Put your finger on the start.
   Start: 0 cm
2. Find where the line ends. Read the number at the other end.
   End: 6 cm
3. Take the start away from the end. The length is the distance between the two numbers.
   6 − 0 = 6
4. Write the answer.
   6 cm

Check. Count along the ruler from 0 to 6: that is 6 centimetres. ✓

Watch out. Start at 0 when you can. If the line starts at 2, take 2 away from the end number.

Key words. Smallest first means the shortest or lowest number comes first.

Method. Measure each one, then put them in order, starting with the smallest number.

1. Measure each one. Count or read the length of each one.
   A: 7 cubes
   B: 2 cubes
   C: 5 cubes
2. Put them in order, starting with the smallest. Put the next one after the one before it.
   B, C, A
3. Write the names in order.
   B, C, A

Check. There are 3 names in the question and 3 in the answer. ✓

Watch out. Check you have not left one out.

Method. Find the start and the end on the ruler. Then take the start away from the end.

1. Find where the line starts. Put your finger on the start.
   Start: 0 cm
2. Find where the line ends. Read the number at the other end.
   End: 9 cm
3. Take the start away from the end. The length is the distance between the two numbers.
   9 − 0 = 9
4. Write the answer.
   9 cm

Check. Count along the ruler from 0 to 9: that is 9 centimetres. ✓

Watch out. Start at 0 when you can. If the line starts at 2, take 2 away from the end number.

Key words. Longer means it reaches further. Shorter means it stops sooner. Taller means it is higher.

Method. Line them up at the same start. Then see which one is longer.

1. Line them up at the same start. Start both at the same place, so the comparison is fair.
   A and B start together
2. Count the units to check. Count each one, one unit at a time.
   A: 4 cubes, B: 7 cubes
3. Compare the two. Look at the far ends. The one that goes further is longer, and the one that stops sooner is shorter.
   4 < 7
4. Write the answer.
   B is longer.

Check. Look at the picture again. A and B start together, and B is the longer one. ✓

Watch out. Do not judge only by where a thing is on the page. Line them up first.

Key words. A unit is the thing we measure with, like a cube or a paper clip.

Method. Line the units up end to end, then count them one at a time.

1. Look at the row of units. The row is the length we measure.
   A row of 6 cubes
2. Count them one at a time. Touch each unit once as you say its number.
   1, 2, 3, 4, 5, 6
3. Write the answer. The last number you say is how long the row is.
   6 cubes

Check. Count again from the other end. You get 6 again. ✓

Watch out. Do not miss a unit at the end, and do not count one twice.

Key words. Longer means it reaches further. Shorter means it stops sooner. Taller means it is higher.

Method. Stand them on the same ground, at the bottom. Then see which one is shorter.

1. Stand them on the same ground, at the bottom. Start both at the same place, so the comparison is fair.
   A and B start together
2. Count the units to check. Count each one, one unit at a time.
   A: 7 cubes, B: 5 cubes
3. Compare the two. Look at the tops. The one that is higher is taller, and the one that is lower is shorter.
   7 > 5
4. Write the answer.
   B is shorter.

Check. Look at the picture again. A and B start together, and B is the shorter one. ✓

Watch out. Do not judge only by where a thing is on the page. Line them up first.

Key words. How much longer means the extra amount that one has.

Method. Line them up at the start. Count the extra part on the longer one.

1. Measure A. Count or read its length.
   A: 8 cubes
2. Measure B. Count or read its length.
   B: 5 cubes
3. Find the extra part. Take the smaller number away from the bigger number.
   8 − 5 = 3
4. Write the answer.
   3 cubes

Check. Check: 5 + 3 = 8. ✓

Watch out. Count only the extra part at the end of the longer one, not the whole of it.

Method. Find the start and the end on the ruler. Then take the start away from the end.

1. Find where the line starts. Put your finger on the start.
   Start: 0 cm
2. Find where the line ends. Read the number at the other end.
   End: 7 cm
3. Take the start away from the end. The length is the distance between the two numbers.
   7 − 0 = 7
4. Write the answer.
   7 cm

Check. Count along the ruler from 0 to 7: that is 7 centimetres. ✓

Watch out. Start at 0 when you can. If the line starts at 2, take 2 away from the end number.

Method. Double means two equal lots of the same number.

1. Start with 4. This is the length we want to double.
   4
2. Add 4 again. Two equal lots make double.
   4 + 4 = 8
3. Write the answer.
   8

Check. Half of 8 is 4, so double 4 must be 8. ✓

Watch out. Double means add the same number again. It is not add one more.

Method. Start with the whole. Take away the part that is cut off.

1. Start with 6 cubes. This is the whole rope before the cut.
   6
2. Take away 2. Count back 2 from 6.
   6 − 2 = 4
3. Write the answer. The rope is now shorter.
   4 cubes

Check. Put the cut part back on: 4 + 2 = 6. ✓

Watch out. Take away the cut part. Check you did not take away the part that is left.

Key words. Smallest first means the shortest or lowest number comes first.

Method. Measure each one, then put them in order, starting with the biggest number.

1. Measure each one. Count or read the length of each one.
   Noah: 4 cubes
   Priya: 2 cubes
   Amira: 6 cubes
2. Put them in order, starting with the biggest. Put the next one after the one before it.
   Amira, Noah, Priya
3. Write the names in order.
   Amira, Noah, Priya

Check. There are 3 names in the question and 3 in the answer. ✓

Watch out. Check you have not left one out.

Method. Measure each one. Two of them match exactly, so they are the same length.

1. Measure each one. Read or count the length of each one.
   A: 4 cm
   B: 7 cm
   C: 4 cm
2. Find the two that match. Things with the same length are the same length.
   A = 4, C = 4
3. Write the answer.
   A and C

Check. Compare each pair to check. Only A and C match. ✓

Watch out. Measure, do not guess from the picture.

Method. Think about the units. The units must be the same size, and they must be in a line.

1. Lay the units in a line. Put them end to end, with no gaps.
   Units in a row
2. Use units of the same size. Otherwise the count cannot be compared.
   Same size, one after the other
3. Count them. Count one at a time, and say the last number.
   Lay the clips end to end, with no gaps. Use clips of the same size.

Check. Count them again to check you get the same number. ✓

Watch out. Two rules: end to end, and the same size.